Story highlights Network that had employees on the bus says seven people died in the attack

A Taliban spokesman claims responsibility, accuses Tolo TV of being part of West's spy networK

U.S. condemns attack and another it says underscore the threat of terrorism

(CNN) A suicide attacker on a motorcycle set off a deadly explosion near a bus carrying media professionals on Wednesday in the heart of Afghanistan's capital, officials said.

Tolo TV network, one of the Afghan broadcasters apparently targeted, put the death toll at seven civilians.

Earlier, Afghan Deputy Interior Minister Mohammad Ayoub Salangi said six civilians, including four women, had died, and at least 24 others were wounded in the Kabul blast.

The bomber targeted a bus carrying staff members from Tolo TV and video production company Kaboora Productions, Afghan Chief Executive Abdullah Abdullah said.

Afghanistan's parliament building and the Russian Embassy are on the road where the blast occurred. It was not clear if the attack wounded any Afghan public officials or foreign diplomats.