Twin bomb explosions kill four in Karachi

Two separate bomb explosions late Saturday killed four people and wounded seven others in Pakistan's port city Karachi, police said.

The first bomb, targeting a government official, exploded in the Eesa Nagri area, killing a police officer and wounding seven people including the official, police said.

"Apparently the bomb was planted in a motorcycle. One police officer has been killed and seven people injured. Condition of some of them is critical," Nasir Lodhi, a senior police official, told AFP.

The second bomb exploded minutes later, killing three people inside a house in the Patel Parra area of the city.

Police official Safdar Mashwani told AFP that it appeared the three people were making a bomb inside the house when it exploded, killing them instantly.

"Preliminary investigations show that they were making a bomb which went off prematurely," Mashwani said.

Karachi, a city of 18 million people, contributes 42 percent of Pakistan's GDP but is rife with murder and kidnappings and has been plagued for years by ethnic, sectarian and political violence.