Cases of homegrown extremism have increased over the past month, posing a mounting threat to United States security, according to a new House Homeland Security Committee report released Monday.

The United States has recorded 39 homegrown jihadist cases across 20 states over the past 12 months, marking an 8 percent increase from March, the committee found in its monthly Terror Threat Snapshot, citing data compiled by the Majority Staff of the Homeland Security Committee.

The trend has grown drastically in the last year. More than 20 percent of the 209 homegrown extremist cases in the United States since the Sept. 11 terrorist attacks have occurred over the past 12 months, the committee reported. More than 60 percent of those cases involved arrests related to the Islamic State terrorist group.

Three Americans with suspected ties to ISIS were indicted in April on terrorism charges. Ohio resident Laith Waleed Alebbini was arrested by FBI agents on April 26 at the Cincinnati International Airport during an attempt to travel to Syria to join ISIS.

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