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Washington • The Trump administration vowed Tuesday to crack down on MS-13, a notoriously brutal Central American street gang blamed for a recent series of killings in suburban New York, and accused Obama-era border policies of allowing its ranks to flourish.

The gang is known for hacking and stabbing victims with machetes, drug dealing, prostitution and other rackets.

Their recruits are middle- and high-school students predominantly in immigrant communities and those who try to leave their risk violent retribution, according to officials.

"These organizations enrich themselves by pedaling poison in our communities, trafficking children for sexual exploitation and inflicting horrific violence in the communities where they operate," Attorney General Jeff Sessions said in remarks before meeting with top federal law enforcement officials on ways to dismantle ultraviolent transnational gangs.

His warnings were echoed in a separate address by Homeland Security Secretary John Kelly and came just hours after President Donald Trump tweeted that "The weak illegal immigration policies of the Obama Admin. allowed bad MS 13 gangs to form in cities across U.S. We are removing them fast!"

More than 10,000 MS-13 are in the U.S., according to federal law enforcement officials.