Fire officials in Lowell were familiar with the building on Queen Street where seven people were killed early Thursday morning.
Sources tell 7News that firefighters have been called to the building at least a dozen times in the past 18 months for fire alarm activations.
One particular emergency response stands out.
On July 3 firefighters were called to the building after a 911 caller reported fireworks being set off inside the building’s hallway.
The State Fire Marshal said they can’t confirm that, but said it is part of the investigation.
"We have heard too that there were fireworks that were present in the building, stored in the building potentially. We need to find them, we need to understand where they were, we need to tie that, if there is a tie, back to the area where the fire originated,” State Fire Marshal Steve Coan said.
Reports also indicate at least one actual fire recently when a neon sign started smoking and an electrical outlet started to burn.
The damage was minor and that fire reportedly extinguished itself.
The building was inspected in March of 2013 when it was sold.
The city inspections department said they found no problems.
"This property is not the type of property that has any type of violations that would bring it to the any greater attention than it deserved,” Eric Slagle, a city employee, said. "Not anything that would indicate danger of this magnitude.”
Investigators expect to send several days trying to determine what caused the fire and where it originated.
On the phone the building owner told 7News he was emotional but could not say more because he was speaking with police officers.