Two NATO tanker caught fire when some unidentified felons opened fire on the tankers at National Highway near Mushkaf, Sibbi, Dunya News reported on Wednesday. Reportedly, a cavalcade of seven Nato lorries were passing through the National Highway when some unknown miscreants opened fire on them. Resultantly, leakage started from a tanker which caught fire.However, no casualty was reported. The nation al highway was closed. Security forces cordoned off the area and launched a search operation.