Upper Providence Township police issued this notice shortly after 3 p.m. Monday:

“Due to heavy police activity in the 100 and 200 blocks of Valley View Rd, residents are being advised to avoid the immediate area.

“Sandy Bank Road will be open for bus transportation, as well as for residents to get home. Also, due to the heavy police presence, you will intermittently hear loud bangs.

“This is due to police activity. You will be updated as soon as information changes.”

Soon another notification was sent out: “Walden school has been placed on lockdown. Students will be remaining indoors as a precautionary measure. There’s no threat to the school. The residents on Valley View Road, please remain indoors until this resolves.”

Dispatch notes showed police, fire and medical units began stagi

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