Men pick up aluminum pieces at the site where a tanker truck exploded in Cap-Haitien, Haiti on December 14, 2021. Photo: AFP

A massive gas truck explosion killed at least 62 people in Haiti on Tuesday, after bystanders swarmed the vehicle to collect spilled fuel - a precious commodity in a nation plagued by acute shortages. 

The blast in Haiti's second city of Cap-Haitien is the latest disaster to hit the poverty-wracked Caribbean nation, riven by gang violence and political paralysis.

Prime Minister Ariel Henry visited the scene of the tragedy, saying his heart was "broken" after meeting some of the dozens of injured in a local hospital. He later tweeted that emergency funds had been released to help deal with the tragedy.

The charred remains of the truck sat in the built-up Samarie area of the city on the country's northern coast. Surrounding buildings were burnt and scarred in the explosion.

Crowds gathered at the site, where some of the dead were left on the road in body bags.

"We have now counted 62 deaths," Deputy Mayor Patrick Almonor said, adding that authorities were still searching for victims in nearby buildings. 

Almonor described a horrific scene, saying he had seen dozens of people "burned alive" and that it was "impossible to identify them."

The truck is believed to have flipped over after the driver lost control while swerving to avoid a motorcycle taxi.

Haiti's civil protection department confirmed the truck had crashed - and that passersby had rushed to collect the escaped gas, a rare commodity amid severe fuel shortages caused by the grip of criminal gangs on the capital Port-au-Prince.

"Following this accident, civilians took the chance to collect the gas by filling up makeshift receptacles - causing a terrible explosion that led to numerous victims and major material damage," civil protection director Jerry Chandler told AFP.

Almonor said around 40 houses in the area were also damaged, but that no details were yet available on the possible victims inside.

The Justinien University Hospital was overwhelmed with patients wounded in the blast.

"We don't have the ability to treat the number of seriously burned people," a nurse told AFP. 

"I'm afraid we won't be able to save them all."

A doctor at the hospital told local radio station Magik9 that two people had died there and that 40 other patients were seriously injured. 

"The people are burned on more than 60 percent of their body," he said.

After visiting the hospital, Henry said: "With a broken heart, I saw the critical condition of some of our compatriots."

The prime minister flew in accompanied by extra health workers, and said in a tweet he had expressed "solidarity with the grieving families."

He earlier promised field hospitals would be rapidly deployed to help care for the blast victims.

Henry declared a period of national mourning following the explosion.

AFP