Explosion outside New York federal building in Manhattan apparently caused by fireworks, sources say

Heavy smoke was seen outside 26 Federal Plaza after an explosion caused by fireworks, sources said. \ CBS

An incendiary device went off outside a federal building in Lower Manhattan Monday morning, and a suspect has been taken into custody, police sources said.

The incident happened outside 26 Federal Plaza, a building that houses dozens of agencies including the FBI, Immigration and Customs Enforcement, and U.S. Citizenship and Immigration Services.

The sound of an explosion had authorities running to the steps leading into the building. They found a man with an airsoft rifle, carbon dioxide cartridges, halogen lighting and a helmet.

Preliminary information indicates fireworks in a garbage can exploded, senior security sources told CBS News. The fire department responded to put out flames, and a man was taken into custody.

The assault was an anti-ICE attack, according to authorities.

The suspect was carrying two types of guns that could be realistic-looking BB guns or airsoft guns, according to preliminary information. One of the two was some type of long gun carried in a grocery cart, law enforcement sources told CBS News.

The sources said an initial review found no shots were fired.

Video from the scene showed heavy smoke in front of the building and law enforcement arresting a man.

Police said people should expect traffic delays, mass transit disruptions and road closures near Worth Street and Lafayette Street. They are urging people to avoid the area.