The calls starting coming in to 911 at 1025 local time. A responding officer, who stopped to render aid, was ambushed by the shooter and seriously wounded. (That is part of the reason that current thinking with an active shooter is to seek out and engage the bad guy, not stop and render aid.) A second cop killed the shooter.
The gunman has not yet been identified, though news reports say he had a 9-11 tattoo. Sikhs wear turbans and beards, but their religious faith has no relationship to Islam.
This is being treated as a case of domestic terrorism (as opposed to Major Hassan’s shooting spree in Texas, which the government is considering to be several dozen separate acts of murder and attempted murder bearing no relationship to terrorism whatsoever).
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Update: The shooter has been identified as Wade Michal Page, 40. He had been in the Army and was discharged in 1998 after having been reduced in rank from Sgt. to Specialist. The details of his discharge were not made public. He was from Milwaukee and had been a tech for the Hawk missile system. He later switched to psychological operations.