Ottawa Police are investigating after a man was gunned down overnight in the ByWard Market.

Ryan Kabuya-Ntumba, 21, was shot near the intersection of George and Dalhousie streets early Canada Day morning, police said in a news release.

Manager of Dunn's Famous 24-hour diner Spencer Kell says he found the victim outside the restaurant.

"He came up to the front and I seen the kid bleeding all over my car," said Kell.

"Everybody was terrified."

Kell says he heard a fight first at around 3 a.m., and then gunshots followed.

"Everybody rushed into our restaurant and that was it," said Kell.

"Few of us gave up our shirts to try and wrap him."

Interim Police Chief, Deputy Chief Steve Bell says police presence has been increased in the market in recent months.

Officers who were already in the area responded to the scene immediately.

"They heard shots fired in the area and responded to it," said Bell.

"Tried to render first aid and then fanned out to the area to look for suspects."

"We've seen far too many last year and again this year," said Ottawa Mayor Jim Watson, going on to call the shooting, unacceptable.

"We don't solve differences by shooting at one another."

Officers who were nearby as part of an initiative to increase police presence in the area quickly ran to the scene.

Police said they did first aid on the man, but he later died in hospital.

It's the second shooting death in the Market in less than a month. Musician Markland Campbell, 42, was shot dead on June 7 about two blocks away from Monday morning's shooting.

An 18-year-old man has been charged with second-degree murder in his death.

There are no suspects in custody at this time.