A top Obama administration official says the fight against terrorism has entered what he calls a new phase. Homeland Security Secretary Jeh Johnson spoke to ABC News on Sunday. He said groups like the self-declared Islamic State are successfully using social media to interest new members or to launch attacks in the United States.
His comments followed reports that federal law enforcement officials have launched hundreds of investigations to identify likely terrorists nationwide.
Mr. Johnson says the terrorist threat has changed because of the successful use of social media by the Islamic State. He says the group has shown the ability to reach out and recruit (招聘,吸收)members in the United States.
"Because of the use of the Internet, we could have little, or no, notice in advance of an independent actor (attacker) attempting to strike. And so that's why law enforcement at the local level needs to be ever more careful, and we're constantly reminding them to do that."
Mr. Johnson says federal, state and local law enforcement officials are cooperating more closely now than they were before the terrorist attacks of September 11, 2001.
Secretary Johnson says federal officials are fighting social media recruitment efforts by talking to members of the Muslim community in the United States. Mr. Johnson admits the Islamic State seems to be effective in its communications. He says Muslim communities must help federal, state and local officials fight the recruiting efforts.
Mr. Johnson supported the decision by U.S. military officials to increase security at bases across the country. The FBI had warned that Islamist militants could attack troops or local police.
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