Rescue efforts were hampered by nightfall

At least 100 people had gathered to watch the flooded river when part of the bridge caved in.

Troops and local people have resumed the search for those still missing, officials say.

Weeks of heavy rain and landslides have killed hundreds of people and displaced many more in Pakistan and India.

The 10m (30ft) high bridge collapsed in Mardan, a city about 100km (60 miles) north-west of the capital, Islamabad, on Saturday.

Relatives of the missing people spent the night in the open near the toppled bridge and many were helping in the search, local mayor, Himayatullah Mayar, said.

Army troops were called out to join civilian aid workers and local residents who used steel cutters, sledge hammers and a crane to break concrete and lift debris.