The gunman in Munich started shooting at a McDonald's across from the Olympia mall around 5:50 p.m. (11:50 a.m. ET), Andrae said.
A witness who wanted to be identified only by her first name, Lauretta, told CNN her son was in the bathroom with a shooter at the restaurant.
"That's where he loaded his weapon," she said. "I hear like an alarm and boom, boom, boom ... and he's still killing the children. The children were sitting to eat. They can't run."
Lauretta said she heard the gunman say, "Allahu Akbar," or "God is great" in Arabic. "I know this because I'm Muslim. I hear this and I only cry."
Huseyin Bayri, a witness of the shooting, said he heard the attacker screaming out that he will kill "foreigners."
"I heard a scream at first: 'You shitty [bleep] foreigners. I am German. You will get it.'"
The gunman moved across the street to the mall, which is adjacent to the site of the 1972 Olympics. Located in a middle-class neighborhood in northern Munich, the shopping mall is the city's biggest and a popular destination for shoppers on Friday nights, German lawmaker Charles Huber told CNN.
Lynn Stein, who said she works at the Jack Wolfskin store in the mall, said she heard several shots.
"People were very confused, and they were running and they were screaming," she said. She saw someone lying on the floor of a store who appeared to be either dead or injured. "There's a woman over them, crying.