Three teenagers sparked an alert after being spotted near the scene of a drowning tragedy at high tide.
Two teenagers died in high tide last month
Police were called to the slipway at Gynn Square in Blackpool, near to where two teenagers drowned last month as they tried to rescue a pet dog.
The three ran away when they heard the sirens, but later received a warning from police about the danger they were putting themselves in at high tide.
In a separate incident, a teenage girl was rescued near the South Pier.
Last month 16-year-olds Alex Kazimir Yorke and Oliver Harvey drowned trying to rescue Oliver's border collie, Sarah, when they got into difficulties near Gynn Square.
The area has a treacherous reputation - in 1983 three Lancashire police officers drowned trying to rescue a Scottish holidaymaker who perished trying to save his pet dog.
A plaque commemorating the three officers is on the sea wall close to the site of the recent tragedy.