Two dogs have died at an Alabama animal shelter, prompting its temporary closure.

Mobile, Alabama, police said in a statement Tuesday that the dogs at the City of Mobile Animal Shelter displayed symptoms of canine distemper, but a confirmed diagnosis is pending from a veterinary lab.

News outlets report that 57 dogs housed in kennels for strays may’ve been exposed. Quarantine protocols have been implemented.

Mobile police added that it’s unlikely any dogs in the adoptions kennels have been exposed, but it’s asking families who adopted dogs on or after Sept. 24 to monitor their pets.

Canine distemper is a contagious disease caused by a virus that attacks dogs’ respiratory, gastrointestinal and nervous systems.

Local animal rescue groups and the county shelter are housing new strays during the quarantine.