Four people were stabbed early Sunday morning at a Marriott hotel in San Mateo, a police sergeant said.
The stabbings were reported at about 2 a.m. at the hotel, located at 1770 S. Amphlett Blvd., San Mateo police Sgt. Al Baccei said.
Four people, all males between 17 and 20 years old, were hospitalized with stab wounds. Two of the victims have been treated for their injuries and released, while the other two remained at the hospital for observation Sunday night, Baccei said.
The stabbings occurred after some sort of altercation, and police are trying to determine whether that altercation started inside the hotel or just outside it, Baccei said.
There were several parties at the hotel involving students from nearby high schools celebrating prom dances, according to Baccei. He said investigators do not know whether any of the parties have a connection to the stabbings.
No arrests have been made, he said.