Flash floods caused by torrential monsoon rain in northwest Pakistan have claimed 144 lives, including dozens killed when a bridge collapsed into a river, a government official said Monday.

The first death was on July 26 when rain started lashing North West Frontier Province bordering Afghanistan, provincial relief commissioner Fazle Rabbi said.

Another 93 people were injured in rain-related incidents, the official said in a statement.

Some 16,000 mud-brick houses were destroyed or damaged by flooding in several districts, including 12,000 in the badly hit district of Mardan northeast of the provincial capital Peshawar.

A bridge collapsed in Mardan on Saturday and the swollen river below swept 41 people to their deaths.

Another 40 people were killed mostly by roof collapses, electrocutions or drowning in central Punjab province last week.

Rains also caused landslides in quake-hit areas, disrupting communications and relief efforts for the survivors.

The October 8 quake killed 73,000 people and left three million homeless in northwest Pakistan and Pakistani Kashmir.

The UN refugee agency says landslides and floods have forced 6,000 quake survivors to return to emergency camps.