Massive Waltham apartment fire was arson, say investigators

WALTHAM, Mass. — A massive fire in Waltham that destroyed a 264-unit apartment building under construction was intentional, said investigators Thursday.

"An extensive scene investigation was over six days...along with interviews and collection of evidence," said State Fire Marshal Peter J. Ostroskey.

He said they systematically eliminated all possible ignition scenarios besides arson.

Waltham Fire Chief Peter Ciccone said they cannot release too much information yet, including why they believe it was arson.

"We've had a lot of cooperation from those in the community providing photos and video," said Waltham Police Chief Keith MacPherson.

Officials are offering a $5,000 reward for anybody who can provide information that leads to an arrest. The property owner and the construction company is offering up to $100,000 to someone who gives information that leads to the arrest and prosecution of those responsible.

The fire happened on July 23 at 20 Cooper St., damaging adjacent buildings and 20 cars. It caused an estimated $110 million in damage.

"This was a significant event," said Ciccone.

Nineteen cities and town responded to help Waltham fire extinguish the blaze.

One of the reasons the fire was so large and strong was the fact the building was made of wood and fire alarms weren't installed yet, leading to a delayed response.

Cox Media Group