A former Married At First Sight contestant has performed a citizen’s arrest to restrain a teen allegedly armed with a machete running down a Melbourne street.

Police received reports of the two teenage boys, one allegedly armed with a machete, chasing another boy down Izett Street in Prahran before 3pm today.

Tim Smith, who was a groom on series 11 of Married at First Sight, witnessed the event and detained one of the boys until officers arrived, while the other fled the scene.

Police arrested the 14-year-old boy from the greater Mildura area and seized a machete.

Smith, speaking to 3AW Radio, Smith said he heard screams and gave chase to the allegedly armed boy.

“Talking to my campaign manager and then we heard some screams and then two guys with the machete come streaming by,” he said.

“I chased the one with the machete.”

Smith said he continued the chase for about 200 metres while the boy yelled out “I’m gonna cut you”, until he managed to detain him.

“When they’ve got a knife in their hand, they’re very confident and very in power. But once that knife is gone, the tears and everything start,” he said.

“There’s just no respect.”

Smith is running as an independent candidate for the seat of Melbourne in the federal election.

“Melbourne’s a great city to live in. It’s just gone down over the last decade, and we need change, and I want to make the change,” he said.

Police are now questioning the 14-year-old boy.

Investigations into the matter remain ongoing.