Chittagong Bureau : Police rounded up six activists of Chatra Shibir from city area yesterday morning. After explosion of the hand bombs at SS Khaled road under kotwali thana , police instantly rounded up six Shibir activists including on bullet injured. The incident wasoccured at 10 am yesterday. Kotwali thana officer incharge confirmed the arrest of six Shibirmen from the spot . A eye witnesses sources said police hurled bullet towards the bomb blasters where one Shibir man was injured. the names of the detained shibirmen yet to be identified. Police also seized a motorbike from their possession, sources said.