91.   Police have never found a clue as to whereabouts.

92.   Police made another search of the area on Thursday using sniffer dogs, but no new clues were found.

93.   Police and fire experts investigated the fumes, but left the station without finding significant clues, the spokesman said.

94.   The incident sparked outrage in Turkey and Germany and baffled police who found no clues indicating a racist or political motive.