At least 12 killed, dozens wounded as three bombs rock Kabul

At least 12 people were killed and dozens other wounded as three bombs rocked the Afghanistan capital Kabul on Thursday.

One of the blasts went off in a bus carrying government employees.

Five employees of the ministry of mines and petroleum were killed and 10 wounded in the bus attack, the officials said, adding that seven people were killed and 21 wounded in the second explosion.

"First a magnetic bomb pasted to a minibus exploded, then a suicide bomber blew himself near the bus attack site and the third blast happened when a car was blown up by unknown militants," said Nasrat Rahimi, a spokesman of the interior ministry in Kabul.

"The death toll could rise from all the three blasts," he said.

No militant group has claimed responsibility for the attacks.

The United States is trying to negotiate a deal that would see foreign forces pull out of Afghanistan. The eighth round of talks is expected to begin this month in Qatar.