Police & Helicopter Wednesday Night

Related to the situation (hostage/shotgun) at 10th & Mass. Late Wednesday night I saw emergency vehicles & a helicopter headed southwest. I suspect they were headed towards the situation on Capitol Hill. Any confirmation ? Apparently the suspect also hit a bicyclist at at 6th & Florida (at up to 80 miles per hour). The bicyclist (has been taken to the hospital). This apparently occured during a police pursuit. He (the suspect) has now barricaded himself inside a rowhouse. It isn't clear if the suspect lives in the rowhouse, or has any connection to the rowhouse. The news (ABC 7) speculates, based on the opinion of neighbors, that it was a random entry (perhaps explaining the rumored hostage situation). The suspect is apparently in the basement with a shotgun (he has been there since around 10:30 pm). Surrounding residents have been evacuated. No further news is yet available.
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UPDATE
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Apparently there has been an arrest. (1:08am)