An unidentified man was mauled by a bear on the runway of a small airport in the southern Alaska town of Seward, ABC News reports.

Officials said the man was walking or jogging with his dogs on the main runway when a brown bear with two cubs accompanying her attacked the man. State Transportation Department spokeswoman Shannon McCarthy said his injuries are non-life threatening, the news outlet reports, and a reason for the attack is unknown, though it’s suspected the bear was protecting its cubs.

The 55-year-old victim reported the attack via a cellphone at 6:46 a.m. and was taken to the hospital, said Seward Police Chief Tom Clemson, according to ABC News. The outlet says the airport has several signs warning that trespassing is prohibited, but the grounds are not completely fenced in.

ABC News reports the airport is located between mountains and the head of Resurrection Bay, which is an area black and brown bears frequent. The airport closed followed the attack but was reopened an hour later. ABC News reports it doesn’t have a staffed control, which leaves pilots to making sure the runway is clear. Airport personnel said the bear returned to where the injured man was but did not attack again, McCarthy said.