OSLO, Norway — A gunman opened fire in Oslo's night-life district early Saturday, killing two people and leaving 10 seriously wounded in what police are investigating as a possible terrorist attack during the Norwegian capital's annual Pride festival.

Investigators said the suspect, identified as a 42-year-old Norwegian citizen originally from Iran, was arrested after opening fire at three locations in downtown Oslo.

While the motive was unclear, organizers of Oslo Pride canceled a parade that was set for Saturday as the highlight of a weeklong festival. One of the shootings happened outside the London Pub, a bar popular with the city's LGBTQ community, just hours before the parade was set to begin.

Police attorney Christian Hatlo said the suspect was being held on suspicion of murder, attempted murder and terrorism, based on the number of people targeted at multiple locations.

"Our overall assessment is that there are grounds to believe that he wanted to cause grave fear in the population," Hatlo said.

Hatlo said the suspect's mental health was also being investigated.

"We need to go through his medical history, if he has any. It's not something that we're aware of now," he said.

The shootings happened around 1 a.m. local time, sending panicked revelers fleeing into the streets or trying to hide from the gunman.

Olav Roenneberg, a journalist from Norwegian public broadcaster NRK, said he witnessed the shooting.

"I saw a man arrive at the site with a bag. He picked up a weapon and started shooting," Roenneberg told NRK. "First I thought it was an air gun. Then the glass of the bar next door was shattered and I understood I had to run for cover."

Another witness, Marcus Nybakken, 46, said he was alerted to the incident by a commotion in the area.

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