A huge landslide has left some homes perilously close to a new cliff edge.
Gardens of nearby houses were caught in the landslide which rolled over the beach and into the sea in Nefyn just minutes after people walked by.
Large parts of clifftop gardens - and even a wooden bench - were carried onto the beach in the fall of thousands of tons of rocks.
Shocking images shows the aftermath of the landslide which took place at around 11am.
Footage shot by a drone shows an aerial view of the cliff collapse and illustrates the scale of the landslide.
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It also shows how close nearby houses on Rhodfa Mor came to being damaged.
Luckily, there does not appear to have been any casualties as ambulances have been called to the scene, North Wales Live reports.
Police have urged people to avoid the area.
Gwynedd South Police tweeted: "We are currently dealing with an incident involving a large landslide on the beach at Nefyn.
"We are aware of people gathering to take photographs - the public are advised to avoid the area until further notice, whilst emergency services and utility companies make the area safe."
Hairdresser Christian Pilling said: "We'd just gone down for a walk and turned round and had the shock of our lives."
"I don't think anyone was on the beach. We'd gone down there about half an hour after it happened.
"It's a good 40m wide but it's hard to tell - it is so big."
Friend Elise Leyshon said: "It is so lucky that no-one was on the beach on a Monday morning. Yesterday it was full of people.
"They would stand no chance if they were caught by that landslide. It is incredible."
Near neighbour Steve Wilding-Hewitt said: "I've never seen anything like it. The police have cordoned a large area off to keep people away from the scene.
"We could see the coastguard shouting to someone in their garden to stay aware from the edge because it was still moving.
"There are some gardens that have been affected. You can see a bench that was at the end of the one of the gardens has fallen into the mud below.
There have been some rockfalls around this coastline for a number of months, but never anything like this. It is frightening."
The small village of Nefyn has a long, sandy bay, sheltered by the Nefyn Headland, and backed by steep slopes.
The landslide happened at about 11am - and neighbours dashed out to see the damage. No casualties were reported.
A North Wales police spokesman said: "We are aware of people gathering to take photographs - the public are advised to avoid the area until further notice.
"The public are advised to avoid the area until further notice, whilst emergency services and utility companies make the area safe."
