Two unknown criminals hurled a bomb at a ticket counter of an intercity bus service on KDA Avenue in Khulna city yesterday leaving four people injured. The injured were identified as Jubaier, Lablu, Ujjal and Kabir. Ujjal is a supervisor of Hanif Enterprise while the others were ticket sellers of the same company. The injured were rushed to Gerib Newaz Clinic for treatment. According to eyewitnesses, the two miscreants hurled the bomb at Hanif Enterprise ticket counter during a power cut in the area around 9:15pm. However, the motive behind the attack could not be known. The police and Rapid Action Battalion personnel cordoned the area off and collected splinters of the bomb for investigation.