Three women were killed in a bomb blast in Pakistani tribal region on Saturday, officials said. According to security officials, the roadside bomb exploded in Mandikas village of Khyber tribal region, bordering Afghanistan. Security forces rushed to the scene to cordon off area for search operation. No group claimed responsibility for the attack. Terrorist activities increased in the tribal region and northwest of the country in recent days after security forces resumed military operation against militants in Kurram and Khyber tribal regions.