[Editor’s note: A tweet citing a scanner report has been moved further down in this post.]

News out of the Boston suburb of Watertown is developing quickly this morning as authorities pursue Boston bombing suspect Dzhokhar Tsarnaev.

Boston PD is asking media to refrain from broadcasting tactical positions.

Update:

Two reportedly in custody:

Live stream:

Update:

This report has been circulating:

Is this tweet what prompted the scanner report that the suspected posted, “I will kill everyone because you killed my brother”?

https://twitter.com/Dzhokhar_A/status/325217061380956160

If so, it appears to be a fake:

Update:

Update:

Did a third suspect hop on a New York-bound Amtrak train?

Update:

Police presence is being reported at the Darien, Connecticut, train station.

Update:

Police believe the suspect may be wearing an explosive vest.

The latest from Watertown: Media have reportedly been told to “run, and then hit the ground.”

Ongoing Twitchy coverage of the hunt for Boston Marathon bombing suspect(s) here.

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