At least seven people were killed and 20 others wounded when an explosion happened in capital Kabul on Tuesday, police said.The blast happened in a commuter bus in Dasht-e-Barchi area of the city, Khalid Zadran, the city'spolice spokesman, said.There was no immediate claim of responsibility for the blast.It comes nearly two weeks after a blast hit a sports club in the same area, killing four people.The post Blast hits commuter bus in Kabul, 7 killed, 20 injured first appeared on Ariana News.