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Key to map (which uses information from Reuters and The Times) — House icons: Towns mentioned in report below. Other icons: Incidents involved in the bombing and chase, in order.

In an unprecedented move, the city of Boston, in its entirety, is being asked to shelter-in-place, with schools and mass transit closed. Nearby Watertown, where police and federal authorities are searching for the Boston Marathon bomber who is still at large, is in lockdown as Friday's manhunt continues.

At this moment, heavily armed members of the military, assisted by local law enforcement, are going door-to-door in Watertown, searching every house, garage, and shed for bombing suspect Dzhokhar Tsarnaev. CNN indicates that 9,000 members of law enforcement are involved in the effort. A no-fly zone is in effect over the town.

Here's the view from @franforman's front porch. Wartime twitter.com/franforman/sta… — Kim Bhasin (@KimBhasin) April 19, 2013



Police evacuate a Watertown resident. (AP)



Police in tactical gear conduct a search for a suspect in the Boston Marathon bombings. (AP)

Incredible photo of swat team (photo: Aram Boghosian/Boston Globe) twitter.com/billy_baker/st… — Mike Hayes (@michaelhayes) April 19, 2013

Authorities have asked businesses to remain closed. According to the Boston Globe, all vehicle traffic is banned in that city. In order to conduct its operation, the police are asking the media not to film what officers are doing.