(CNN) A Chinese student who was attacked with a stun gun and kidnapped in Canada has been found unharmed, police said.

Lu Wanzhen, 22, was seized on Saturday from an underground parking garage by four masked men. Police had been searching for him, but only succeeded in tracking down the car used in his abduction.

A 35-year-old man earlier arrested in connection with the case was released unconditionally, and the suspects remain at large.

"On Tuesday, March 26, 2019, shortly before 9 p.m., a man walked up to a residence on Doe Lake Road in the town of Gravenhurst (in Ontario), looking for help," police said in a statement. The man was later identified as Lu and taken to hospital with minor injuries suffered in the kidnapping.

"Investigators have been in close contact with Mr. Lu's family and have provided them with the updated information," the statement said.

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