Congress group to target extremists in online 'dark space'

By Dustin Volz WASHINGTON (Reuters) - Violent extremists’ use of encryption to evade law enforcement in communicating online will be examined by a task force proposed by a Republican lawmaker on Monday, adding to pressures on Silicon Valley to do more in fighting militant groups. Citing concerns about violent extremists communicating in potentially undetectable "dark space" online, Representative Michael McCaul, chairman of the House Homeland Security Committee, said he wants to set up a c