Two men accused of murdering two transgender women last month in Puerto Rico have been indicted by a federal grand jury.

Sean Díaz de Leon and Juan Carlos Pagán Bonilla were indicted on four charges, including carjacking resulting in death, using a firearm in relation to crimes of violence, and destruction of property using explosive materials.

The women, Angelique Velázquez, 32, and Layla Pelaz, 21, were shot to death, their bodies placed in a car under a bridge in the municipality of Humacao on the island's southeast coast and set on fire.

Díaz, 19, and Pagán, 21, are accused of killing the women on April 21. According to an FBI affidavit, the men had sexual relations with the women at Pelaz's home. Pelaz told Díaz that they were transgender after they had been intimate. Díaz, who was furious, told Pagán that the women were transgender.

In an attempt to calm the men, Pelaz proposed they go buy some marijuana to smoke and talk. Díaz shot the women as Pagán drove Pelaz's car. The men then parked the car under the bridge and set it on fire.

(Related: HRC condemns new civil code in Puerto Rico, says it would “roll back” LGBT rights.)

The men have been charged under the Matthew Shepard and James Byrd Jr. Hate Crimes Prevention Act. If convicted, they could face the death penalty.

Five transgender people have been murdered in Puerto Rico this year, including Velázquez and Pelaz.