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A blast went off in the Federal Investigation Agency office in Lahore killing at least 20 people and injuring several.

Latest reports suggest that number of casualties could go up as the building has been completely destroyed.

There is still confusion over the nature of the attack - whether its a bomb or a suicide attack.

Over 100 employees were in the building at the time of the blast, which also triggered fires in vehicles in the parking lot.

LAHORE: The death toll as a result of twin blasts in Lahore has increased to 20 and dozens others have injured the sources said.

At least sixteen people were killed in suicide attack in the FIA building and four others were killed in Model town blast, the police said.

One blast occurred at Lahore model Town Block-F near to Bilawal House and residence of Lahore City Nazim Amir Mehmood. The other blast occurred at FIA Office near Mayo hospital at Temple road.

According to the preliminary investigation it was suicide attack at FIA Office. The attack occurred at about 920AM.

Two suicide bombers entered into the FIA building, one blew himself up at the gate and the other managed to enter inside the building to target the people present in the building.

The dead bodies and dozens injured have been shifted Lahore Mayo hospital, the sources said.

The police and rescue team are busing in rescue activities in the city. The fear has gripped the area due to blasts.