FBI investigators, Bridgeport and state police arrested four people today in conjunction with a pair of federal drug raids. Authorities say three people were arrested at a home on Voight Street and that a fourth suspect was taken into custody separately. FBI officials raided a North Avenue condominium earlier in the day, but released the two suspects found inside. The U.S. Attorney's Office confirmed that the incident was part of at least two anti-drug operations in the city. A spokesperson says authorities were searching for suspects linked to a murder, but would not give specific details. Officials say one of the suspects, Jeff Thomas, has been charged with trying to strike an FBI agent with his vehicle.