In Manipur, a powerful bomb blast took place at the high security zone near M-Sector and Raj Bhawan in Imphal early this morning. Police sources said, the incident took place at around 5.30 am. No one was injured in the incident. This is the third incident of bomb blast in this week. Police cordoned the area and conducted search operations just after the incident. However, there is no report of any arrest in connection with the blast.