As many as 600 suicide bombers are present in the Pakistani port city of Karachi, where they are planning to carry out a major attack, arrested militants of an al-Qaeda linked banned outfit have told the police.

"Approximately 600 Jundullah militants are present in Karachi. They are mentally prepared and trained to commit suicide attacks," Qasim Toori and Danish alias Talha, arrested on January 29, were quoted as saying by a source privy to the interrogation.

Most of the suicide bombers were former students of Islamabad's Lal Masjid, which was stormed by the military last July to flush out extremists, the source told the Daily Times.

The militants confessed that they had robbed foreign banks and dispatched the money to their headquarters in Wana, from where their needs for weapons, explosives and other necessities were being met.

The source added that law-enforcement personnel had also taken into custody two disabled brothers, Abu Abdullah and Gohar Muhammad, who, authorities suspect, were going to carry out suicide attacks.

The militants confessed that they were planning to target several key leaders of Altaf Hussein-led Muttahida Quami Movement and some high-profile government officials before the February 18 general elections, the daily reported.

Sources told the paper that the militants wanted to target the top leadership of the MQM and its workers as the party had supported the military crackdown on Lal Masjid.

Toori was wanted in connection with a June 2004 gun attack on Karachi Corps Commander General Ahsan Saleem Hayat, which had claimed 11 lives. Hayat survived the attack and 11 Jundullah activists were later sentenced to death in connection to the case.