Bristol Police search for a 6 ft (1.8m) long crocodile after a bus driver sees one under a bridge.
The force did not reveal details of the extent of the search - or indicate how seriously they were taking the sighting.
"We were called at 10:28am on Monday, February 3, to reports of a crocodile sighted on Bedminster Bridge," the spokesman said.
"We carried out a search of the area but found no trace of the reptile."
However in a new development the Bristol Police are tracking the crocodile on his twitter account Chris the Croc @TheBristolCroc