President Barack Obama reaches for a pen as he signs S. 665, the Rafael Ramos and Wenjian Liu National Blue Alert Act of 2015, Tuesday, May 19, 2015, in the Oval Office of the White House in Washington. From left are, Justin Ramos, 19, Jayden Ramos, 14, Vice President Joe Biden, Maritza Ramos, Sen. Ben Cardin, D-Md., Rep. Dave Reichert, R-Wash., Rep. Bill Pascrell, D-N.J., Wei Tang Liu, and Xiu Li. The bill will assist with the establishment of a nationwide Blue Alert system to apprehend violent criminals who have injured or killed police officers or who have made an imminent or credible threat to cause serious injury or death of a law enforcement officer. The bill is named in honor of two New York City Police Detectives who were killed while sitting in their patrol vehicle in Dec. 2014.

Obama signs bill creating nationwide alert system for police

The new system would be similar to the Amber Alerts used to find abducted children.

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Obama puts stricter controls on military-style equipment for police

The issue of police militarization rose to prominence last year.