PDT 10:45 p.m.

Police just took man into custody at Watertown Massachuchu.

Large police scrum.

Two others taken into custody before I tuned in. They have no idea if these people are connected to the MIT policeman who got shot.

NewsCenter 5's Sean Kelly reported.

The scene was located on Laurel and Dexter Street in Watertown.

Police are urging everyone to stay inside of their homes. The area is considered extremely dangerous.

The SWAT team, Cambridge, Boston and Watertown Police along with Homeland Security and the ATF all rushed to the area.

The suspects are reportedly connected to a carjacking that took place in the Cambridge area.

It was not immediately clear if the incident was related to the fatal shooting of an MIT campus police officer.

Live: http://livewire.wcvb.com/Event/117th_Running_of_Boston_Marathon

No additional information was immediately available.