An explosion rocked Afghanistan's Kabul on Thursday but caused no casualties, Qari Saeed Khosty, spokesman for the Afghan Ministry of Interior, wrote on Twitter.

The bomb struck a civilian vehicle at a busy traffic circle in Karte Parwan locality at about 4:15 p.m. local time. 

Pictures on social media showed a column of thick smoke sent into the sky by the blast. 

Xinhua reported that several buildings were damaged, citing witnesses. 

It's not immediately clear what the target of the attack was and no group has claimed responsibility.