Searchers were unable to find any additional signs of a missing Seattle firefighter whose car was found Saturday at Deception Pass Bridge.

Seattle police began investigating Joshua Ryan Milton’s disappearance after he failed to arrive for his shift Thursday as a paramedic student at Harborview Medical Center, the Seattle Times reported.

Jack Hartt, Deception Pass Park manager, said park rangers first noticed the car parked at the bridge Friday night. When it was still there in the morning, they investigated and found that it belonged to the missing firefighter.

Hartt said the park staff searched the park on foot and boats were launched to search the waters below the bridge. There happened to be a race through the park over the weekend, which helped with the search.

While Milton is still considered missing, Hartt said searchers have their suspicions. A Coupeville man killed himself by jumping from the bridge last month.

“It’s one of the sad parts of Deception Pass,” Hartt said.

“That does happen.”