QUETTA/Khyber Agency - Unidentified armed men set on fire two Nato oil tankers in Dera Murad Jamali on Thursday while a bombing of a Nato tanker in Khyber Agency destroyed the tanker and three other vehicles. No loss of life was reported in both the incidents. Unidentified gunmen riding a bike opened fire at two oil tankers carrying fuel for Nato forces in Nothal area of Dera Murad Jamali in Naseeabad district of Balochistan and later set the tankers on fire, police said, adding that the vehicles were gutted and thousands of liters fuel destroyed. Police rushed to the site and cordoned off the entire area to trace out the suspects, who managed their escape. Police registered a case and started investigations. In Khyber Agency, a Nato oil supply tanker and four vehicles were reduced to ashes when unidentified militants blew up the tanker by installing magnetic time bomb at the bypass road in Landi Kotal tehsil, political administration sources said. Sources informed that last morning an Afghanistan bound Nato tanker was on its way to deliver the supplies when a bomb attached to it went off. The tanker caught fire and as the spilling oil spread over the road the fire engulfed two other trailers and a taxicab car coming from opposite side that too were burnt to ashes. The fire was extinguished after hectic efforts by the local fire brigade crew however the Landi Kotal bypass road remained closed to all kinds of traffic for almost three hours. Abdullah Azam group of TTP claimed the responsibility of the attack. Abu Musab, a TTP spokesman, speaking from an unknown location told reporters on phone that they would increase their attacks on the Nato supplies in Khyber Agency. Over past few weeks the militants have increased their sabotage activities and attacks on Nato supplies. In the last two months over 51 Nato oil tankers, other trucks and mini-coaches have been destroyed in Landikotal and Torkham border area.