Dozens of people have been killed in a stampede at a religious festival in the north-east of Israel.

Newspaper Haaretz reports at least 38 people have been killed. Emergency services are evacuating the injured.

Prime Minister Benjamin Netanyahu described it as a "heavy disaster", and said he was praying for the casualties.

The Lag B'Omer festival at the foot of Mount Meron is the largest event held in the country since the coronavirus pandemic began, with tens of thousands reportedly attending - despite concerns about spreading the virus.

Dozens of ambulances are at the scene and emergency services have laid out bodies under foil covers on the ground. Police have asked everyone at the site

Emergency officials said 38 people were in critical condition at the site, with six more critically injured by evacuated. Dozens more were wounded less seriously.

"MDA is fighting for the lives of dozens wounded, and will not give up until the last victim is evacuated," a tweet read.

What's the latest?

Early reports suggested a structure at the site collapsed, but MDA officials later said it was the result of a stampede. Police sources told Haaretz that it started after some attendees slipped on some steps, causing dozens more to fall.

"It happened in a split second; people just fell, trampling each other. It was a disaster," a witnesses told the newspaper.

Videos posted online show thousands of people tightly packed together for the event, before struggling to flee the chaos as the incident unfolded.

One pilgrim reportedly thought there was a bomb alert when loudhailer messages were heard urging the crowds to disperse.

"No one imagined that this could happen here," the man reportedly told Channel 12 TV. "Rejoicing became mourning, a great light became a deep darkness."

Earlier in the day officials said they were not able to enforce coronavirus restrictions at the site due to the huge crowds.

Police reportedly said they had arrested two people for disrupting their efforts to keep order before the stampede occurred.

What is the Lag B'Omer festival?

Tens of thousands of Orthodox Jews make a pilgrimage to Meron each year for Lag B'Omer, an annual religious holiday marked with all-night bonfires, prayer and dancing.

The town is the site of the tomb of Rabbi Shimon Bar Yochai, a second-century sage, and is considered to be one of the holiest sites in the Jewish world.

According to the Times of Israel, organisers estimated that 100,000 people arrived on Thursday night, with more due to arrive on Friday.

Last year's celebration was restricted, but Israel's successful vaccination programme - one of the fastest in the world - has allowed it to lift many restrictions in recent months.