A series of gas explosions an official described as "Armageddon" killed a teenager, injured at least 10 other people and ignited fires in at least 39 homes in three communities north of Boston on Thursday, forcing entire neighbourhoods to evacuate as crews scrambled to fight the flames and shut off the gas.
Authorities said Leonel Rondon, 18, of Lawrence, died after a chimney toppled by an exploding house crashed into his car. He was rushed to a Boston hospital but pronounced dead there in the evening.
Massachusetts State Police urged all residents with homes serviced by Columbia Gas in Lawrence, Andover and North Andover to evacuate, snarling traffic and causing widespread confusion as residents and local officials struggled to understand what was happening.
"It looked like Armageddon, it really did," Andover Fire Chief Michael Mansfield told reporters. "There were billows of smoke coming from Lawrence behind me. I could see pillars of smoke in front of me from the town of Andover."
Governor Charlie Baker said state and local authorities are investigating but that it could take days or weeks before they turn up answers.
"This is still very much an active scene," he said. "There will be plenty of time later tonight, tomorrow morning and into the next day to do some of the work around determining exactly what happened and why."
Hours after the explosions, the utility's parent company issued a brief statement saying its crews were still performing safety checks in the area.
"Our thoughts are with everyone affected by today's incident," Indiana-based NiSource said in a statement. "The first priority for our crews at the scene is to ensure the safety of our customers and the community."
Baker previously said authorities hadn't heard directly from Columbia Gas, but later called the company's response "adequate".
By late Thursday, all of the fires had been doused but many areas remained silent and dark after residents fled and after power companies cut electricity to prevent further fires.
Schools in all three communities were cancelled for Friday, and some schools were being used as shelters for residents.
Lawrence resident Bruce Razin was among the evacuees standing outside the Colonial Heights neighbourhood near the city's high school trying to decide what to do next late on Thursday.
Officials had cut power in the area and the streets were pitch black, save for emergency vehicle lights. Razin said he arrived just as residents were being evacuated, and immediately saw the house two doors down was levelled from an explosion.
"I couldn't imagine if that was my house," said Razin, who purchased his home nearly two years ago. "It's total destruction. I'd be completely devastated."
With a backpack filled with personal items he had hastily grabbed, he said he'd head to his mother's home a few towns over for the night.
In Lawrence, a man whose neighbourhood was among dozens that erupted in fire says he ran into his basement to find that the room was glowing.
Resident Ra Nam says he was in his yard when the smoke detector in his basement went off around 16:30 EDT on Thursday.
When he ran downstairs and saw the boiler on fire, he quickly grabbed a fire extinguisher and put it out. Minutes later, Nam said he heard a loud boom from his neighbour's house and the ground shook.
Nam said a woman and two kids had made it out of the house but the basement was on fire.
Lawrence General Hospital said it was treating 10 victims, including at least one in critical condition.
The Massachusetts Emergency Management Agency blamed the fires on gas lines that had become over-pressurised but said investigators were still examining what happened.
Columbia had announced earlier on Thursday that it would be upgrading gas lines in neighbourhoods across the state, including the area where the explosions happened.
It was not clear whether work was happening there Thursday, and a spokesperson did not return calls.