The UW's emergency alert system just sent out a message that read:

Mon Dec 3 2:11 p.m.
UW ALERT: SHOTS FIRED: Report of shots fired at the University Book Store, 4326 University Way NE, Veh fled from scene, Blk Audi

This was followed at 2:36 p.m. by:

UW Alert Update: Suspect vehicle and suspect located away from campus at east Lake Washington Blvd near Roanoke. This is an active police response. Stay out of area.

A third alert, at 3:00 p.m. read:

UW Alert: Suspect vehicle moving again 45th/Montlake Stay out area [sic]. Active, slow police pursuit near the campus. Listen for sirens and see lights stay out of area.

And a fourth, at 3:01:

UW Alert: Shooting suspect in custody at 17th Ave and NE 45th Street. Traffic being shut down at Memorial and 45th. Update to follow.

According to sources at the bookstore and this KOMO News report, the window of the clothing shop Crossroads, on the corner of 43rd and the Ave, was "shattered by gunfire," but no one was hurt. The circumstances of the shooting remain unclear.