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Authorities planned to release details at a Monday afternoon news conference, but said a man and a woman had been killed.
A law enforcement officer with knowledge of the situation said the gunman was found dead inside a unit at the housing development around 2:20 p.m.
He spoke on condition of anonymity because he was not authorized to publicly discuss the case before a scheduled 3:45 p.m. news conference.
By mid-afternoon there were indications the situation had been resolved. School buses traveled along roads, some barricades had been lifted and a police dog team had been called back to police headquarters.
Lisa Santana, who lives near the shooting scene, said the sound of gunfire jolted her out of bed.
"I was sleeping in my bed and I heard gunshots - five of them, maybe 10. Oh, my God," she said.
She looked outside and saw a man's body on the pavement. Within minutes, police were knocking on her door, telling her she had to evacuate for her safety.
She took refuge at the municipal building, where she was worried about her son, a seventh-grade student at a school nearby.
Schools in the district locked down to prevent students from leaving. But children were being taught in classes as usual while police sought the gunman.
"I want my son right now," Santana said. "I want to go home. I don't know what's going on. All they told us is we had to leave."