An explosion rocked a Shiite section of Pakistan's largest city Sunday, killing at least 45 people and wounding dozens, according to officials and local television reports.
Two-bomb laden vehicles exploded in a residential area of Karachi and local officials searched for victims trapped in the rubble.
Officials earlier said at least 25 were dead, but a Pakistani doctor said Monday that the toll had risen to 45 as wounded victims died overnight, according to reports in Pakistan's The Nation and Dawn.
The Associated Press said the blast occurred outside a Shiite Mosque as people were leaving evening prayers.
Azhar Iqbal, a local police official, told the AP that a bomb appeared to have been rigged to a motorcycle and that the damage indicated there could have been additional explosives at the scene. Iqbal said several nearby buildings caught on fire. Published reports have indicated women and children were among the dead.
Police in Karachi told Reuters a suicide bomber may have been responsible for the attack.
No one has claimed responsibility for the attacks, but Sunni militants linked to al-Qaida and the Taliban have targeted Shiites in the past.
Reuters and The Associated Press contributed to this report.
