British backpacker Aiden Webb missing in Vietnam for three days

Aiden Webb's girlfriend said she lost contact with him after he injured himself in a fall and could not find the trail again

Aiden Webb, 22, has been missing since Friday (Lisa Webb/Facebook)

A British backpacker has gone missing after falling while climbing the Fansipan Mountain, near Sa Pa, northwest Vietnam.

Aiden Webb, 22, has not been heard from since Friday when he was supposed to meet a friend at the bottom of the mountain following his climb.

His girlfriend, Bluebell Baughan, said on Facebook she lost contact with him after he called her to tell her fell and couldn't find the trail again in.

She said he had injured his arm and knee in the fall.

A Go Fund Me page set up to raise money to help pay for the search received over £1,800 in donations in 22 hours.

The page says it costs £12 per person per day to hire for search and rescue.

"What Aiden needs is as many experienced locals as possible looking for him", the page adds. "We are asking for anything you can give, but £12 is an extra set of eyes for a day."

Mr Webb's father, Trevor, and his uncle, Michael, flew out on Sunday evening to help in the search, his aunt Lisa Webb said in a Facebook post.

On Monday, two teams began to search along the streams Mr Webb may have followed down the mountain. A team of forest rangers will begin a search of his last known location at 8am on Tuesday.