PESHAWAR (AFP) - Three people were killed Thursday in a drive-by shooting in Dera Ismail Khan, police and hospital officials said. Gunmen riding on a motorbike sprayed bullets on a medical store in the town, killing its owner and two relatives, a police official said, requesting anonymity. Three other men were wounded, he said, adding that the victims were from the Sunni community. "The killings were linked to sectarian violence," he added. Confirming the casualties, Dr Ashiq Saleem, head of the local hospital, said that "six people with bullet wounds were admitted, three off them died later." Meanwhile, a bomb was thrown into a police station in a northwestern Pakistan town late Thursday, wounding three people, police said. The blast took place in Shabqadar town in Charsadda district of North West Frontier Province (NWFP), which borders Afghanistan. "Two people riding on a motorbike hurled the explosive material into the police station, which went off with a big bang," Karamat Shah, who is in charge of the police station, told AFP. Two police officials and a civilian were injured, he said, adding that their condition was "stable." Meanwhile, a powerful electricity tower was blown up by some unknown assailants here in Armar area on late Wednesday night, suspending power supply to adjacent areas. Police sources said that assailants had planted explosives under a 500kv tower, which went off late night and suspended power supply to Armar and other areas. Shaukat Afzal, PESCO spokesman confirmed that incident, saying that some unknown assailants had blown up tower no 295 and added that the affected areas had been supplying power through alternate ways.