KOMO 4 News has learned that inside the apartment, police found guns, ammunition, and a hand grenade.
Officially, police say they were just there to issue a search warrant, but the people who live here told us that police tell them the raid was connected to Saturday's shootings on Capitol Hill shooting.
Police came to search an apartment where twin brothers have lived for the past four or five years. When one of the brothers came home, police put him in handcuffs and took him away.
"Well, they said it was in connection with the shootings down on Capitol Hill that happened," said apartment manager Regina Gray.
The folks who run the apartments tell us police told them little else. But, we do know officers evacuated the entire third floor of the complex where the brothers lived.
We've also been told, police collected weapons, numerous rounds of ammunition and a grenade from the apartment.
On top of that, apartment managers tell us one of the brothers drove a black pick-up truck similar to the one police say the shooter drove to the Capitol Hill murders.
Those who knew them can't believe one of the brothers may have murdered six people and injured two others at a Capitol Hill house party, before turning the gun on himself.
"I wouldn't suspect them of anything," said assistant manager Jim Pickett, adding he would be shocked to hear if they were involved in the shootings.
"I couldn't see them hurtin' a thing," said apartment manager Gordon Gray. "I mean, they like to hunt. But other than that, hey, they're not harmful."
The people who run the apartment complex say the brothers moved in four or five years ago and they say they have never given anyone at this apartment complex any trouble.
We don't know what, if any connection the brother handcuffed and taken away by police had to the shooting. As of late Saturday evening, he's yet to be booked into jail.