ISLAMABAD: Four people were killed and six others injured in a car bomb blast in the restive North West Frontier Province on the eve of Pakistan's Independence
Day.
    
The blast occurred near the town of Kalam in the mountainous Swat valley today in which four persons were killed, District Police Office, Muhammad Iqbal told the TV
channels here.
     
Though initial reports said that the deaths could have been caused by lightening, later it was confirmed that the incident took place due to explosion, he said.
    
Several suicide attacks and car bombings have rocked Pakistan' tribal areas and remote areas of the North West Frontier Province (NWFP) bordering Afghanistan after the July 11 military raid on Lal Masjid here, in which over 90 Islamic militants were killed.