Commander Kirk Wilson told KKTV that two of the officers were evacuated and authorities are still trying to reach the third.
He could not immediately say how the officers were doing or how the gunman was contained.
Earlier, ambulances and police vehicles were lined up near an intersection and police told people via Twitter to stay away from the "active shooter scene" because it was not secure.
Footage from KKTV showed police cars and officers stationed along closed streets outside a nearby shopping center.
Pelosi said customers and store employees were confused about what was going on but not panicked. He said a couple dozen customers were standing near the store entrance waiting for instructions.
"It's not usually a busy day for us, and no one is panicking or anything," Pelosi said. "But they haven't told us anything except that we're not allowed to go outside."
Planned Parenthood is a national woman's health care provider that offers abortions at some of its clinics.
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