Officers were trying to make contact with people inside a home in the Fryelands neighborhood around 9 p.m.
By 10 p.m., they determined no one was there.
Officers remained on the scene pending a search warrant.
“We do believe there are weapons inside the home,” Monroe police spokeswoman Debbie Willis said. “We have attempted to make contact but so far they are not responding.”
Police received a report around 5:40 p.m. about a possible exchange of gunfire between a passing car and people inside the home in the 154th Street block of Esther Avenue, Willis said.
“We are still trying to sort it all out,” she said.
There were no reported injuries.
Willis said she had no idea how many suspects might have been involved or about a motive.
Off-duty police officers were called in to help with containment.
More Local News Headlines
Two-year, $38.2B state budget passes; shutdown averted Local fire crews help battle Wenatchee blaze Snohomish County sheriff: Help us solve young couple’s 1987 murders Proposed ferry fares on deck at Whidbey Island hearing Granite Falls seeks grant to replace 81-year-old bridge Granite Falls to hike vehicle license fees by $20 Front Porch: Snohomish hosts outdoor movies Tulalip fire death blamed on outdoor burning that spread
Our new comment system is not supported in IE 7. Please upgrade your browser here.