GAITHERSBURG, Md. (WUSA9) — Montgomery County police have raised the alarm in an attempt to track down two alleged MS-13 gang members.

Two men, 20-year-old Jose Coreas Ventura and 27-year-old Oscar Ernesto Delgado-Perez, are accused of helping to kill an 18-year-old man in a Gaithersburg Park on June 16th. Both are charged with first-degree murder.

Montgomery County police said the homicide of Cristian Antonio Villagran-Morales happened in Malcolm King Park located at 1200 West Side Drive.

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On Thursday, police called the killing a “senseless assassination.” They said the 18-year-old victim was a New Jersey landscape worker who'd come to the area recently for a job.

Two other suspects have been arrested. They include a 19-year-old woman accused of luring the victim to the park by promising sex.

The gang members allegedly approached the victim and asked him if he wanted to go into the woods and smoke marijuana, police said. Villagran-Morales went with the group of members and never came back.

This was the tenth gang-related murder in the county in 10 months. Six killings have been linked to MS-13

Police said the collapse of a gang truce in El Salvador has increased tensions among gang members in the U.S.

Investigators said unaccompanied minors who have been sent to the U.S. by fearful families in Central America are easy targets for recruitment into gangs because they have no family, little money, and poor English.

Local gang members frequently use social media to learn the identities of newcomers’ family members remaining in Central America. They then extort money from victims in the U.S. by threatening to kill family members in their native countries.