A steady stream of police officers entered a Toronto hospital on Sunday, all hoping that one of their colleagues will survive a collision that has put his life in jeopardy.

Toronto police Const. John Zivcic remains in critical condition after his unmarked police vehicle was involved in a collision on Saturday afternoon, near Bloor Street West and Neilson Drive.

A second vehicle was involved in the crash, though Zivcic’s vehicle ended up colliding with a tree.

The 34-year-old officer was rushed to hospital and underwent surgery on the day of the crash.

Twenty-four hours later, all police could say was that his condition had not changed.

"No change folks," Deputy Chief Peter Sloly told reporters on Sunday.

Deputy Chief Peter Sloly talks to reporters on Dec. 1, 2013

Toronto police Deputy Chief Peter Sloly told reporters Sunday that there had been no change in the condition of Const. John Zivcic, the officer injured in a crash near Bloor Street West and Neilson Road. (CBC)

Thanking the public for their support, Sloly said that police are doing "everything that we can do to keep the family is supported."

He asked that others keep Zivcic "in thoughts and prayers and that’s all we can ask."

Zivcic, who is in his seventh year with the Toronto police force, hails from St. Catharines, Ont.

Police say Zivcic was en route to a call at the time of the Saturday afternoon crash.

Mike McCormack, the president of the Toronto Police Association, said the officer’s family was thankful for the support they had received from the force and from the public — though they are going through an extremely difficult situation.

"They’re devastated, obviously. They are very stressed right now," McCormack said Sunday.

With reports from the CBC's Charlsie Agro and Steven Bull