MUNICH, July 23 (Xinhua) — Nine people were killed and 16 others injured in a shooting attack in southern German city of Munich on Friday evening before the shooter shot himself dead, said Munich police early on Saturday.

The shooter, identified as an 18-year-old German-Iranian, held dual citizenship of Germany and Iran and had lived in Munich for more than two years, said Munich police chief Hubertus Andrae at a press conference.

Three of the injured are in serious conditions, and some children were wounded, Andrae said.

The attacker was likely to have acted alone. "There is currently no evidence of other attackers," Andrae said, adding that "the background and motive of the attack remain unclear."

He said that it was unknown whether there was any Asian among the victims.

A total of 2,300 policemen and special forces were deployed in the action after the attack, including forces from neighboring federal states and Austria, according to Andrae.

Public transport service in the city was suspended after the attack on Friday but was restored later.