U.S. residents suspected of joining plot to kill American troops

Four U.S. residents are arrested and they now face up to 15 years in federal prison. Investigators say the group of men were plotting to join Al Qaeda and kill American troops.

Social media played a role in helping officers catch the men. They say three of the suspected terrorists allegedly posted jihad content on the popular site, Facebook. Authorities have reported the men come from a variety of ethnic backgrounds.