A shark sighting in Hong Kong caused popular beaches to close down at the height of summer. The shark was reportedly seen off the south of the Chinese territory, according to AFP.

Twelve beaches were closed throughout the day over the extended holiday weekend. Signs were put up on beaches warning visitors to not enter the water. Inspections in the waters did not turn up traces of the stray shark but authorities warned the public to stay in enclosed zones of the shark prevention nets.

Shark sighting are rare in Hong Kong. Experts told the AFP that the swimmer could’ve mistaken a harmless whale shark for the dangerous animal.