At least 30 people using homeless and refugee shelters in Toronto have tested positive for COVID-19, officials said Tuesday.

The largest outbreak was reported at Willowdale Welcome Centre, a shelter for refugees in the city’s north end, said the CEO of Homes First Society, the organization that runs the facility.

“I’m worried about our clients, I’m worried about our management team, I’m worried about our staff, they’re quite frightened,” Patricia Mueller said.