Ferry service to Toronto Island will be reduced for the rest of the summer after a weekend collision at the downtown terminal that injured a dozen people.

The City of Toronto's parks department said one ferry has been taken out of service and other vessels will be operating at reduced capacity going forward.

"Until further notice, there will be only three ferries operating between Jack Layton Ferry Terminal and Toronto Island — two passenger-only vessels and one vehicle/passenger vessel," the city said in a statement. "Unnecessary vehicular passage is discouraged."

Those who want to cross to the island are warned to brace for longer than usual wait times for the remainder of the summer.

The city said safety is its top priority and it has ensured the ferry vessels meet the Transport Canada safety standards and have required certificates. Those include an annual Transport Canada safety and security certificate, which was issued on June 21, and an engine and transmission inspection, most recently issued on Aug. 10, it said.

An inspector will need to sign off on the proper safety procedures and measures before full operations can resume, the city said.

Police say the crash happened at around 5 p.m. on Saturday as the boat approached the terminal with more than 900 people on board.

Twelve people sustained minor injuries and five were taken to hospital for treatment, though none of the injuries were deemed serious.

The cause of the crash was not immediately known. Police are investigating and the Transportation Safety Board of Canada said it is also sending a team to look into the incident.