ISLAMABAD, Pakistan - A Pakistani court issued an arrest warrant for ousted military leader Pervez Musharraf on Saturday over allegations he played a role in the 2007 assassination of an ex-prime minister and rival. It was a major setback for the onetime US ally, who was seeking a political comeback from outside the country.

Musharraf, who has not been charged, described accusations that he had a hand in the attack on ex-Prime Minister Benazir Bhutto as a smear campaign by a government led by her aggrieved husband.

The stunning allegation that Musharraf - a self-declared opponent of Islamic militancy - was linked to extremists accused in the attack was likely to keep him out of Pakistan, at least in the short term.