Twenty-two people were taken to hospital after an electronic music festival at Ontario Place on Saturday night.

Paramedics, who were monitoring the concert throughout the night, said that most of the illnesses were drug- or alcohol-related.

One patient is in critical condition, EMS said.

Nearly 29,000 fans gathered at Ontario Place for the Digital Dreams Music Festival, one of the largest concerts of its genre in North America.

In May, 29 people were sent to hospital after a concert at the Rogers Centre.