KHAR, Pakistan: At least six people including two infants were killed when a vehicle hit a roadside bomb in restive northwest Pakistan Tuesday, officials said.
The attack came in Salarzai area of Bajaur tribal region, which lies on the Afghan border and has recently been attacked by the militants from across the frontier.
The officials said that the dead included three women who were school teachers, and two of their infant children.
"According to initial reports, six civilians, including three lady teachers, two children and one passerby have embraced shahadat (martyrdom)," a security official said.
Local administration official Sohail Khan confirmed the incident.
Another official in Peshawar said that the van was carrying the women and their children to a local community school run by an aid group funded by international charities.
No group claimed responsibility, but Islamist militants hiding in the lawless border areas have carried out such attacks in the past.
Bajaur is one of seven semi-autonomous districts that make up the tribal regions branded by the U.S. as the most dangerous place on earth, where Pakistan's military has launched a series of operations against homegrown insurgents in recent years.
Militants based in Afghanistan have attacked Pakistani security posts in the area a number of times souring diplomatic ties between Islamabad and Kabul.