Chechen Omar al-Shishani (centre) led Jaysh al-Muhajirin before it split, and is now part of the al-Qaeda-affiliated ISIS. BBC

U.S., Foreign Fighters In Syria Pose 'Very Serious Threat' To U.S.: Lawmaker -- Reuters

(Reuters) - Hundreds of U.S., British and Canadian citizens who have trained with Islamic State fighters trying to carve out their own state in Iraq and Syria pose a "very serious threat" to the United States, a top Republican lawmaker said Sunday.

Representative Mike Rogers, chairman of the House Intelligence Committee, urged the Obama administration to aggressively prosecute U.S. citizens who had trained overseas as it weighed options for how to respond to escalating violence by Islamic State militants in Iraq.

He said an attack on the Jewish museum in Brussels in May had shown a new push by extremist groups to carry out attacks on Western targets, and growing efforts to recruit backers on social media.

"I'm very concerned because we don't know every single person who has gone and trained and learned how to fight," Rogers told "Fox News Sunday."

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My Comment: The FBI disagrees with this assessment .... FBI: No credible threats to US from Islamic State (AP). What's my tak e .... we should worry.