Two Chelsea High School students were stabbed and seriously injured Friday afternoon near the commuter rail tracks, and police were searching for at least one suspect, officials said.

Both victims suffered wounds to their abdomens during the attack, which occurred around 2:25 p.m. at Everett Avenue and Maple Street, Chelsea police Chief Brian Kyes said in an e-mail. At least one person showed a knife and attacked the students, who are both 19, he said.

Kyes said the youths were treated at the scene and taken to Massachusetts General Hospital. The stabbing happened after a fight broke out on Everett Avenue by the Wyndham Hotel around dismissal time at the nearby high school, authorities said.

Police Captain Keith Houghton said the student who was more seriously injured was stable but required surgery. The second victim’s condition was not known.

Kyes said a motive for the stabbings was unclear, but the victims may know whoever attacked them.

He said one suspect was described as a Hispanic male, about 20 years old, with short hair on the sides and a “spiked top front.’’ The man was wearing a black jacket, blue pants, and Nike sneakers, and he was armed with a knife, Kyes said.

Houghton said police were reviewing surveillance video and interviewing witnesses.

Chelsea school Superintendent Mary Bourque referred questions to police, citing the pending investigation.

Commuter rail service was halted while detectives collected evidence, Houghton said.

Leslie Aun, a spokeswoman for Keolis, the commuter rail operator, said that at about 4:10 p.m. traffic was halted in the area for about 45 minutes. Passengers on one train had to be bused around the area while another train was held, she said.

TRAVIS ANDERSEN

GLOBE STAFF

Travis Andersen can be reached at travis.andersen@globe.com. Follow him on Twitter @TAGlobe.