"One man detonated his explosive jacket near the entrance of ministry of power and water resources. The bomber was killed on the spot and one civilian also died as a result of the explosion," Xinhua reported quoting a police source as saying.
The target of the attack has not been ascertained, according to the source.
The incident happened in an area where several government buildings, including the parliament building, are located.
SRK-Gauri anniversary: B-Town stars and their non-filmi better halves
Birthday special: Popular mothers and daughters in Bollywood
Spotted: 'Kaabil' star Hrithik Roshan with dad Rakesh Roshan
'Rock On 2' trailer launch: Farhan, Shraddha enthrall audience with live gig
Flashback: When bikini babes set a new world record in Australia