A grand jury indicted 17 alleged members and associates of the notoriously violent MS-13 gang, it was confirmed Thursday.

Officials announced the charges which include murder and drug trafficking after a seven-month investigation that spanned several states.

Nassau County District Attorney Madeline Singas said the county and the federal Drug Enforcement Agency started the investigation into the gang's activities in May.

The agency identified activities that stretched from New York to New Jersey, Maryland, Virginia and Texas.

Four unidentified members of the Mara Salvatrucha 'MS-13' (juvenile gang) show their tattoos in the unit where they are kept imprisioned in Tamara, 30km north of Tegucigalpa in February 2006

Members of the Mara Salvatrucha poses for a picture, in Tegucigalpa in September 2014. A grand jury indicted 17 alleged members, it was announced Thursday

It started with a focus on narcotics trafficking but expanded to encompass murder and other acts of violence, including the killing of a 15-year-old Long Island boy, and focused on the 'Hollywood' and 'Sailors' cliques, or cells, of MS-13 on Long Island.

Officials said the Long Island clique leaders answered to leaders in El Salvador, and sent them proceeds from criminal activity.

'This massive multi-agency investigation laid bare the global size, complexity and brutality of MS-13, and these indictments strike a heavy blow to the gang's operations on Long Island,' Singas said.

'These alleged gang members have terrorized vulnerable immigrant communities (and) trafficked deadly heroin into our neighborhoods.'

Federal prosecutors believe MS-13, or the Mara Salvatrucha, has thousands of members across the U.S., mostly Central American immigrants.

US President Donald Trump (L) sits with Attorney General Jeff Sessions on December 15, 2017 in Quantico, Virginia, before the FBI National Academy graduation ceremony. Trump and Sessions will visit Long Island to speak on efforts to fight the gang

The gang, believed to be behind 25 killings on Long Island in the past two years, has become a prime target of President Donald Trump, with both Trump and U.S. Attorney General Jeff Sessions coming to Long Island to speak on efforts to fight it.

The gang originated in Los Angeles in the 1980s, though it's now led from Central America.

The indictment includes the murder of Angel Soler, who was 15 when he disappeared in July.

His body was discovered in mid-October in a wooded lot in the hamlet of Roosevelt. Soler's remains were one of three sets found close to each other over the course of nine days.

This 15-year-old, Angel Soler, disappeared in July. Alleged MS-13 members are suspected in Soler's death

Authorities have said Soler was attacked by a group of people and hacked to death with a machete, and a 26-year-old man was charged in November with his murder.

The criminal complaint in that case said the suspect acted with others who had not yet been arrested.

The indictment announced Thursday names another alleged MS-13 member as a suspect in Soler's death.

Officials said the investigation also helped thwart murders that were being planned.

Investigators also passed on information that led to arrests of individuals in Maryland suspected of being gang members in connection to murders in that state.