Eighteen policemen were injured in a suicide attack on a police checkpoint in Bannu on Monday. According to police sources, a suicide bomber exploded his car at Baranpul police checkpoint on Miranshah road that damaged the building of the checkpost. Eighteen including 16 FC officials and two policemen were injured in the attack The injured were shifted to district hospital Bannu. DSP Tahir Dawar has confirmed that 11 officials sustained injuries. He said security has been tightened after the blast. Meanwhile, militants blown up a girls school in Khunki Qila area. Police had arrested a man with 10 kilogram bomb from the same area and shifted him to undisclosed location.