ANCHORAGE, Alaska (AP) — Anchorage health officials on Friday recommended up to 300 people associated with a youth hockey tournament quarantine or isolate after “a cluster” of COVID-19 cases were identified.

The Anchorage Health Department said players, coaches and fans from parts of south-central Alaska and Juneau attended the tournament, which was held Oct. 2-4.

The department said it encouraged everyone who attended who does not have symptoms to quarantine for 14 days, except to get tested, and encouraged those with symptoms to isolate for 10 days, except to get tested.

Dr. Janet Johnston, the department’s epidemiologist, said that means the department is recommending up to 300 isolate or quarantine.

Heather Harris, the department’s director, could not provide “concrete” numbers of positive cases associated with the tournament. She said the tournament organizers said they tried to enforce masking guidelines and kept a contact log of participants.

Contact trace investigations indicated “significant close contact in indoor spaces, including locker rooms, with inconsistent use of face coverings,” the city health department said in a release.

For most people, the coronavirus causes mild or moderate symptoms. For some, especially older adults and people with existing health problems, it can cause more severe illness and death.