11.   Police were investigating but had no immediate clues as to the identity of the perpetrators of the attack.

12.   The two sides met privately for nearly four hours but provided no immediate clues afterward about the specifics of their talks.

13.   There was no immediate clue to his whereabouts.

14.   There were no immediate clues, officials said.

15.   There were no immediate clues as to why the two officers were killed.

16.   But police said they had no immediate clue as to the identity of the attackers.

17.   But there was no immediate clue to the identity of the gunmen, who were armed with automatic rifles and rocket-propelled grenades, Interfax news agency said.

18.   There was no immediate clue to the identity of the gunmen.

19.   There was no immediate clue as to the motive of the gunman.

20.   Police said it was evidently set deliberately using inflammable material, but said they had no immediate clues indicating a racist motive.