FBI, Homeland Security on High Alert Over 4th of July Weekend

After the attack in Tunisia, U.S. law enforcement are on the lookout for possible ISIS-inspired attacks.
1:57 | 06/28/15

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Transcript for FBI, Homeland Security on High Alert Over 4th of July Weekend
than just sharks. Warning law enforcement officials to be aware of possible terrorist attacks. ABC's senior justice correspondent Pierre Thomas is here and on the story. Reporter: Good morning, Dan. As Isis claims responsibility for those horrific attacks overseas, here, law enforcement is locked in. A nightmare caught on tape in Tunisia. As a gunman begins Sprague bullets at beach resort filled with tourists. Dozens more injured. Witnesses saying gunman was smiling while executing the innocent. That attack drawing close scrutiny here at home. The FBI and homeland security warning law enforcement to be on alert of possible isis-related attacks. The concern is real, because Isis has launched an unprecedented social media campaign. Launching 90,000 messages worldwide. And using hip-hop to recruit the young and videos with the young to soften their image. What we're seeing with Isis is a message of violent and hate. Convince people to carry out attacks. Reporter: Trying to track the followers here, with hundreds of investigations under way. Earlier this month, a Boston man was killed allegedly plotting to behead a police officer. In Garland, Texas, two suspected terrorists shot by police. So, this Independence day, to be blunt, no one is taking any chances, Dan. I think that makes good chance. 90,000 messages a day. That is a staggering number.

This transcript has been automatically generated and may not be 100% accurate.

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