The first blast came around 8:10 am (03:40 GMT) when a suicide bomber riding a motorcycle hit a bus in eastern Kabul, according to interior ministry spokesman Nasrat Rahimi. He said the bus belonged to the ministry of mines and petroleum, and warned the death toll could change.
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Rahimi said two other blasts had occurred, including a car bomb, also in eastern Kabul. No details were immediately available on the other two blasts, and no group immediately claimed responsibility.
The US is negotiating for a deal that would see foreign forces pull out of the country in return for various Taliban security guarantees, including a pledge that Afghanistan will not become a safe haven for terror groups. Some observers say the insurgents are increasing attacks to gain greater leverage in the talks.