Pakistani officials say a bomb ripped through an oil tanker carrying supplies for a NATO forces in Afghanistan, killing at least one person.
The attack took place Wednesday at a police checkpoint in the southwestern border town of Chaman.
No one claimed responsibility, though militants frequently stage attacks on convoys passing through the volatile region.
In other violence Wednesday, two young girls were killed and two others injured when a hand grenade was thrown at a house in a residential area in the northwestern city of Peshawar.
Pakistani officials are warning that thousands of villagers in the north of the country are at risk of losing their homes to a lake that could soon burst its banks.
Officials say they hope to avert a disaster by building a spillway to prevent the lake, located near the town of Gilgit, from overflowing. The spillway will take about two weeks to complete.
A landslide in early January killed 20 people and blocked the Hunza River, creating the 15-kilometer-long lake now threatening to burst its banks.
Flooding from the lake could wipe out the Karakoram Highway, a significant trading route that links Pakistan with China.
Some information for this report was provided by AP, AFP and Reuters.