Shia Muslims in Lahore, Pakistan, carry coffins of victims who were killed in a bomb blast which took place during a Shia Muslim procession on Wednesday. (Mohsin Raza/Reuters)

Thousands of Shia Muslims, thumping their chests and crying, mourned Thursday at funeral prayers for victims of a triple bombing that heaped more tragedy on Pakistan, which is already struggling to cope with devastating floods.

The blasts that targeted a Shia ceremony late Wednesday in Lahore were the first major attacks since flood waters tore through the country over the past month, destroying or damaging more than one million homes and prompting a major international relief effort that continues to struggle with the scale of the destruction.

Interior Minister Rehman Malik on Thursday blamed the Taliban for the bombings. At least 35 people were killed and 250 wounded in the attacks on a street procession marking the death anniversary of caliph Ali, one of Shia Islam's most respected holy men.

Two of the blasts were apparently suicide bombs. Afterward, crowds torched a police station and vehicles. Authorities deployed paramilitary forces to restore order.

The bodies of eight victims were prayed over in a public park not far from the scene of the bombings. Security was tight, with police frisking mourners. Their families then took them to be buried.

Sunni militants have launched dozens of attacks against Shias and other Islamic sects and religions in Pakistan in recent years. The extremists believe it is permissible, even honourable, to kill members of other faiths.