Police are concerned for the whereabouts of two men who were last seen near a beach in Pwllheli.
It's believed Simon and Connor were heading to the beach off Hafan Y Mor with inflatable kayaks at around 6.30pm on Tuesday evening.
Coastguards led a ten-hour search for the pair, which was called off late on Thursday night.
North Wales Police are appealing for anyone with information to come forward.
Chief Inspector Ian Roberts said: "Officers are conducting enquiries and searching in the locality, supported by colleagues from HM Coastguard."
"If you were on the beach on Tuesday evening, or have any information that could help us find Simon and Connor, please contact us via our live webchat or on 101 quoting reference O118860."
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