LONDRES (AP) — El marchista Alex Schwazer, que venía a Londres a defender su título olímpico de los 50 kilómetros, dio positivo de dopaje y no podrá competir, informaron dirigentes deportivos el lunes.

El Comité Olímpico Italiano informó que Schwazer ha dado positivo de dopaje y ha abandonado la delegación. El lunes, más temprano, el equipo italiano informó que un atleta no identificado había dado positivo en un análisis realizado por la Agencia Mundial Antidopaje antes de llegar a Londres. No se dieron detalles del resultado positivo

Schwazer, de 27 años, tenía la misión de defender el primer puesto que consiguió en Beijing 2008. La prueba de los 50 kilómetros se disputa el domingo.

El italiano ganó el oro con un récord olímpico de tres horas, 37 minutos, nueve segundos.

La Federación Italiana de Atletismo dijo que se le notificó del resultado el lunes por la tarde.

"Aunque coincidimos plenamente con la decisión del Comité, (la federación) expresa su profunda decepción por lo ocurrido y enfatiza su postura firme de condena contra el dopaje", indicó la organización en un comunicado.

Por la mañana, el judoka estadounidense Nick Delpopolo fue expulsado de los Juegos Olímpicos, tras detectársele marihuana en su organismo, que, según dijo, comió accidentalmente antes de venir a Londres.

Delpopolo fue así el primero de 10.500 deportistas expulsado por encontrársele sustancias prohibidas ya en los juegos.

Otros cuatro deportistas habían quedado afuera por controles positivos en competencias previas.

El Comité Olímpico Internacional dijo que había descalificado a Delpopolo en la división de 73 kilos, en la que había terminado séptimo.

Delpopolo pidió disculpas en un comunicado por lo que describió como "un error que me avergüenza".

"Mi positivo fue causado por el consumo inadvertido de comida en cuya preparación habían usado marihuana antes de venir a los Juegos Olímpicos", señaló.

Delpopolo nació en lo que es hoy Montenegro y fue adoptado por una familia estadounidense.

Loading Slideshow...
  • Saudi Arabia's Wojdan Shahrkani and Puerto Rico's Melissa Mojica compete during the women's 78-kg judo competition at the 2012 Summer Olympics, Friday, Aug. 3, 2012, in London. (AP Photo/Mike Groll)

  • Saudi Arabia's Wojdan Shahrkani and Puerto Rico's Melissa Mojica compete during the women's 78-kg judo competition at the 2012 Summer Olympics, Friday, Aug. 3, 2012, in London. (AP Photo/Mike Groll)

  • Saudi Arabia's Wojdan Shahrkani reacts after the women's 78-kg judo competition against Puerto Rico's Melissa Mojica at the 2012 Summer Olympics, Friday, Aug. 3, 2012, in London. (AP Photo/Paul Sancya)

  • Oreydi Despaigne of Cuba is disappointed after losing to Ramziddin Sayidov of Uzbekistan during the men's 100-kg judo competition at the 2012 Summer Olympics, Thursday, Aug. 2, 2012, in London. (AP Photo/Paul Sancya)

  • Yuri Alvear, of Colombia, reacts after defeating Chen Fei of China, to win the bronze medal during the women's 70-kg judo competition at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012, in London. (AP Photo/Paul Sancya)

  • Chen Fei of China, left, and Yuri Alvear, of Colombia, compete for the bronze medal during the women's 70-kg judo competition at the 2012 Summer Olympics, Wednesday, Aug. 1, 2012, in London. (AP Photo/Paul Sancya)

  • France's Gévrise Emane (white) competes

    France's Gévrise Emane (white) competes with Cuba's Yaritza Abel Rojas (blue) during their women's -63kg judo contest match of the London 2012 Olympic Games on July 31, 2012 ExCel arena in London. AFP PHOTO / JOHANNES EISELE (Photo credit should read JOHANNES EISELE/AFP/GettyImages)

  • France's Gévrise Emane (white) competes

    France's Gévrise Emane (white) competes with Cuba's Yaritza Abel Rojas (blue) during their women's -63kg judo contest match of the London 2012 Olympic Games on July 31, 2012 ExCel arena in London. AFP PHOTO / JOHANNES EISELE (Photo credit should read JOHANNES EISELE/AFP/GettyImages)

  • Olympics Day 3 - Judo

    LONDON, ENGLAND - JULY 30: Ioulietta Boukouvala of Greece (white) competes with Yurileidys Lupetey Cobas of Cuba on Day 3 of the London 2012 Olympic Games at ExCeL on July 30, 2012 in London, England. (Photo by Julian Finney/Getty Images)

  • North Korea's An Kae Um, left, competes with Cuba's Acosta Bermoy during the gold medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Lasha Shavdatuashvili

    Georgia's Lasha Shavdatuashvili holds up his gold medal in the men's 66-kg gold judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Japan's Masashi Ebinuma competes with Poland's Pawel Zagrodnik, rifht, during a bronze medal match in the men's 66-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Felipe Kitadai of Brazil competes against Gwang-Hyeon Choi of the Republic of Korea (in blue) during the semifinal round of the men's 60kg judo competition at the 2012 Summer Olympics, Saturday, July 28, 2012, in London. (AP Photo/Paul Sancya)

  • France's Priscilla Gneto competes with Belgium's Ilse Heylen, right, during a bronze medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • North Korea's An Kae Um celebrates after defeating Cuba's Acosta Bermoy in the gold medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Arsen Galstyan of Russia (in blue) celebrates after winning against Rishod Sobirov of Uzbekistan during the semifinal round of the men's 60kg judo competition at the 2012 Summer Olympics, Saturday, July 28, 2012, in London. (AP Photo/Paul Sancya)

  • Georgia's Lasha Shavdatuashvili competes with Hungary's Miklos Ungvari, top, during the gold medal match in the men's 66-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Georgia's Lasha Shavdatuashvili competes with Hungary's Miklos Ungvari, left, during the gold medal match in the men's 66-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Cuba's Acosta Bermoy rests on the mat after losing to North Korea's An Kae Um in the gold medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • North Korea's An Kae Um competes with Cuba's Acosta Bermoy, right, during the gold medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • North Korea's An Kae Um competes with Cuba's Acosta Bermoy, left, during the gold medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Cuba's Acosta Bermoy rests on the mat after losing to North Korea's An Kae Um in the gold medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Arsen Galstyan of Russia (in blue) competes against Rishod Sobirov of Uzbekistan during the semifinal round of the men's 60kg judo competition at the 2012 Summer Olympics, Saturday, July 28, 2012, in London. (AP Photo/Paul Sancya)

  • Sofiane Milous of France competes against Hovhannes Davtyan of Armenia (in blue) during the semifinal round of the men's 60kg judo competition at the 2012 Summer Olympics, Saturday, July 28, 2012, in London. (AP Photo/Paul Sancya)

  • Eva Csernoviczki of Hungary (in blue) competes against Wu Shugen of China during the semifinal round of the women's 48kg judo competition at the 2012 Summer Olympics, Saturday, July 28, 2012, in London. (AP Photo/Paul Sancya)

  • Italy's Rosalba Forciniti, left, reacts after throwing Luxembourg's Marie Muller to the mat during a bronze medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Italy's Rosalba Forciniti, left, throws Luxembourg's Marie Muller to the mat during a bronze medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)

  • Luxembourg's Marie Muller, left, competes with Italy's Rosalba Forciniti during a bronze medal match in the women's 52-kg judo competition at the 2012 Summer Olympics, Sunday, July 29, 2012, in London. (AP Photo/Paul Sancya)