Two arrested in Harvard Medical School explosion

• U.S. Attorney Leah B. Foley said Tuesday that the pair detonated a Roman candle, a large commercial firework, inside a Harvard research laboratory.
• Foley confirmed the incident was isolated with no continuing threat to the community.

Zoom in: Surveillance footage captured the pair lighting fireworks near campus at 2:24am on Saturday, Foley said.

• She said the footage shows the men climbing scaffolding to get to the roof before the explosion occurred around 2:45am.

The blast occurred in the Goldenson Building's neurobiology department.

• No injuries or structural damage were reported.
• The suspects fled in opposite directions and discarded distinctive clothing items, according to Foley.

No attorneys were listed for either defendant in court records as of Tuesday afternoon.

What they're saying: "The conduct alleged in the charging documents was not only irresponsible and risky, it was criminal, and there are consequences for those who commit federal crimes," Foley said at a Boston press conference.

The big picture: The arrests came after authorities released surveillance images. Public tips helped identify the suspects.