Witnesses say an explosion targeted a Taliban vehicle in the provincial city of Jalalabad , the second such deadly blast in as many days in an Islamic State stronghold .
The Taliban and IS extremists are enemies, and fought each other even before the Taliban seized control of Afghanistan last month.
Witnesses say Sunday's blast targeted a vehicle of the border police, which is now run by the Taliban. Initial reports said five people were killed, including two civilians, among them a child. The Taliban were not immediately available for comment about possible casualties among their ranks.
