BBC News, this is Mike Cooper.

Millitants have carried out a second big bomb attack in as many days against police in northwestern Pakistan. At least twenty people were killed. The Pakistani authorities say militants may be taking advantages of the floods to step up their attacks. As Marian L. reports.

Police say a car bomb detonated at the gates of a residential police compound. The powerful explosion caused several buildings to collapse and more people are feared to be trapped under the rubble. With the run-up to Eid, the festival celebrating the end of Ramadan, many people were out in the streets about to break the fast when the bomb went off. There have been three other big bomb attacks in Pakistan in the last week alone, killing almost 120 people. On Monday, the Pakistan Taliban said they carried out the suicide bombing on a police station that killed 19 people.