Authorities said Monday they are investigating the death of a 21-year-old murder suspect who was shot during an arrest attempt by US federal agents. The suspect, Jimmy Abel Rodriguez, died Saturday after he was shot twice when agents from the US Bureau of Alcohol Tobacco and Firearms tried to arrest him in a poor neighborhood of San Juan on warrants for one murder in New York and three in Puerto Rico. Authorities declined to provide details about the incident, including what prompted the shooting and whether the suspect was armed. The FBI and Puerto Rican police said they were investigating. "Based on preliminary information of what occurred it's being investigated as a possible attack on a federal agent," said Agent Harry Rodriguez, a spokesman for the FBI in San Juan.