Two men are missing in the sea at Brighton after getting into trouble in severe weather, the Coastguard said.
They were among four men who had gone into the water at the resort early on Saturday.
Two men managed to get back to shore and called the Coastguard just after 01:00 GMT, telling them their companions were missing.
Coastguard and lifeboat teams are looking for the men, but strong winds are hampering search efforts.
Coastguard rescue teams from nearby Shoreham and Newhaven and the Shoreham all-weather lifeboat are searching for the pair.
The Coastguard rescue helicopter has been dispatched to the scene, and the Newhaven all-weather lifeboat was also reported on its way to assist.
Matt West, UK Coastguard Controller, said: "The unfavourable weather on scene is making the search extremely difficult for those involved.
"The weather is currently south west eight to severe gale force nine with very high waves."