It was not immediately possible to verify the authenticity of the video. In the past, more than 70 alleged supporters of ISIS were arrested in the last two years. Citizens were asked to report any suspicious activity to the police “It’s not just Europe. I think we here in the United States need to be obviously quite vigilant,” CIA Director John Brennan said. . U.S. Capitol Police sent a security awareness reminder to congressional offices. The investigation about recent Paris attacks revealed that terrorists possibly have used encryption technology to hide their computer and cellphone communications.