Five soldiers including a junior officer of the Pakistan Army were killed in a remote-controlled bomb explosion in North Waziristan on Thursday afternoon, a military official said on Thursday. The improvised explosive device was placed between Dattakhel and Miranshah area to targeted a military convoy, said the official who asked not to be named. The condition of two wounded soldiers is stated to be serious. "Four jawans were killed on the spot. The fifth died on his way to hospital," the source said. He did not say where the convoy was heading. The dead soldiers were a havaldar, a JCO and three sepoys. This is the highest number of soldiers killed in a single attack in North Waziristan this year. The official said that no arrests were made so far. "In this type of activity, it is not easy to make quick arrests. But the (political) administration will use local tribal laws to apprehend the perpetrators of the crime," he said.