ISLAMABAD, Pakistan (AP) — Gunmen on motorcycles sprayed a van carrying employees from a community centre with bullets Tuesday, killing five female teachers and two aid workers, but sparing a child they took out of the vehicle before opening fire.

The director of the group that the seven worked for says he suspects it may have been the latest in a series of attacks targeting anti-polio efforts in Pakistan. Some militants oppose the vaccination campaigns, accusing health workers of acting as spies for the US and alleging the vaccine is intended to make Muslim children sterile.

Last month, nine people working on an anti-polio vaccination campaign were shot and killed. Four of those shootings were in the northwest where Tuesday's attack took place.

The attack was another reminder of the risks to women educators and aid workers from Islamic militants who oppose their work. It was in the same conservative province where militants shot and seriously wounded 15-year-old Malala Yousufzai, an outspoken young activist for girls' education, in October.

There was no immediate claim of responsibility for the latest shootings.

The teachers and health workers — one man and one woman — were killed in Khyber Pakhtunkhwa province on their way home from a community center in the town of Swabi where they were employed at a medical clinic and primary school. Their driver was also injured.