Toronto, Apr 24 (AP) A 25-year-old who plowed a van into a crowded Toronto sidewalk was ordered held Tuesday on 10 counts of murder and 13 of attempted murder as Canadian authorities and the public sought to make sense of what appeared to be one of the deadliest mass murders in the country's modern history.

Alek Minassian showed little overt emotion as he made a brief appearance in a Toronto courtroom in a white jumpsuit and handcuffs. The judge ordered him detained without bond and scheduled the next hearing for May 10. Police, meanwhile, still appeared to be gathering evidence.

About 20 officers made their way down the van's deadly path on Yonge Street searching for any evidence. Nearby, mourners had put together a makeshift memorial to the victims.

"It was like he was playing a video game, trying to kill as many people as possible," said Panna Patel, 42, who stopped by the memorial and had been at the scene a day earlier, getting cash from an ATM as it occurred.

"He was looking people directly in the eye, making eye contact, it was so scary. He wasn't remorseful at all." Prime Minister Justin Trudeau dismissed the possibility of terrorism, saying that authorities see no national security element in the case.

He told a news conference that the incident "hasn't changed the overall threat level in Canada," though it occurred as Cabinet ministers from the G7 nations were meeting in Toronto.

Authorities so far had not disclosed a possible motive or cause, though "the incident definitely looked deliberate," Police Chief Mark Saunders told reporters at a late-night news conference.

Saunders said Minassian, who lives in the Toronto suburb of Richmond Hill, had not been known to police previously. An online social media profile described him as a college student.

Authorities released few details in the case, saying the investigation was still underway, with witnesses being interviewed and surveillance video being examined.

"We are looking very strongly to what the exact motivation was for this particular incident to take place," Saunders said. "We need every single piece of this puzzle so we can have a fulsome picture and account as to exactly what took place here." The driver was heading south on busy Yonge Street around 1:30 p.m. and the streets were crowded with people enjoying an unseasonably warm day when the van jumped onto the sidewalk.

Ali Shaker, who was driving near the van at the time, told Canadian broadcast outlet CP24 that the driver appeared to be moving deliberately through the crowd at more than 30 mph.

"He just went on the sidewalk," a distraught Shaker said. "He just started hitting everybody, man. He hit every single person on the sidewalk. Anybody in his way he would hit." Witness Peter Kang told CTV News that the driver did not seem to make any effort to stop.

"If it was an accident he would have stopped," Kang said. "But the person just went through the sidewalk. He could have stopped."

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