Mansfield police say two people died, a score were transported to the hospital, and 45 were arrested after a concert at the Comcast Center there on Thursday night.

Nineteen-year-old Connor Brandon of Acton died at Boston Medical Center, while Dominic Impelizzieri, 27, of Syracuse, N.Y., died at Rhode Island Hospital. Both died from drugs and alcohol in their systems, Police Chief Arthur M. O’Neill said in a statement.

There were 21 medical transports to Sturdy Hospital in Attleboro for drug issues. One of the persons was found lying in the road in traffic; another was found stumbling out of the woods after daylight, the statement said.

Ten people were arrested for drug possession, 25 were arrested for being a person under age 21 in possession of alcohol, three for disorderly conduct, one for domestic assault and battery, and five for possession of a forged license. Alex Marotte, 21, of Springfield was arrested and charged with posession of ecstasy with intent to distribute.

“These matters continue to be actively investigated by Mansfield Police Department detectives,” said O’Neill.

The “Identity Tour” was a “rave” concert that offered several performance stages and techno music, police said.

Police learned this morning of Brandon’s death. They said he died from the effects of several drugs and alcohol.

Impelizzieri was revived from full cardiac arrest by emergency workers posted at the concert, but later succumbed to the substances he had ingested, the statement said.