11.   Although guerrilla bands also have been active near the region, police said they suspected the attack was related to drug trafficking.

12.   But Berlin police said the Monday attacks may be related to unrest in Istanbul involving the Alawite sect of Islam and Moslem fundamentalists.

13.   Investigators said they believe the attacks were related to a murder investigation.

14.   It is unclear if the attack was related to the U.S. military operation in Afghanistan.

15.   It is not clear yet if the attack was related to the U.S. strikes in Afghanistan.

16.   It is unclear whether the attack was related to the U.S. military operation in Afghanistan.

17.   It was trying to determine whether the Thursday and Friday attacks were related.

18.   It was unclear whether the attacks were related to tensions over the U.S.-led airstrikes.

19.   It was unclear whether the attacks were related.

20.   It was unclear whether the attack was related to recent unrest in Pakistan over U.S.-led airstrikes on Afghanistan.