A new report on the emergency response to the Boston Marathon bombings was largely positive but criticized law enforcement for the chaotic gunfight in which one suspect was killed and a police officer seriously injured, saying it lacked coordination.

The 50-page report released Thursday by Harvard University says the response to the April 15 explosions that killed three people was the result of “years of investment of time and hard work by people across multiple jurisdictions.”

The report says the gunfight that occurred four days after the explosions became confusing as officers from multiple agencies arrived in Watertown and opened fire, placing themselves and the public in danger. The report suggested better training to avoid “contagious” gunfire.

No official report on the shooting has been released.

(AP)