But they weren’t interested enough. There are just so many devout Muslims who could become jihadis, the feds can’t keep up with them all. And that’s the idea: the Islamic State has said that it wants to overwhelm law enforcement with so many jihad attacks and plots that it can’t keep up with them all, and the system collapses.

“Omar Mateen, Terrorist Who Attacked Orlando Gay Club, Had Been Investigated by FBI,” by Michael Daly, Justin Miller and Katie Zavadski, Daily Beast, June 12, 2016 (thanks to Cecilia):

Omar Mateen of Port Saint Lucie, Florida, came to the attention of federal authorities twice prior to being identified as the gunman in the Orlando nightclub mass shooting, a senior law enforcement source told The Daily Beast.

Mateen killed 53 people and shot more than 100 in total at the Pulse gay nightclub early Sunday morning, in the deadliest mass shooting in modern American history.

The senior law enforcement source reports that Mateen became a person of interest in 2013 and again in 2014. The Federal Bureau of Investigation at one point opened an investigation on Mateen but subsequently closed the case when it produced nothing that appeared to warrant further investigation.

“He’s a known quantity,” the source said. “He’s been on the radar before.”

The gunman is said by the source to have been born in New York and to have been married for a time to a woman from New Jersey. His father, Seddique Mateen, appears to reside in Florida, but is said to be presently running for office in Afghanistan.

Seddique told NBC News that the sight of two men kissing angered his son.

“We are saying we are apologizing for the whole incident. We weren’t aware of any action he is taking,” Seddique said. “We are in shock like the whole country.” Seddique added that the attack “has nothing to do with religion.”

Florida incorporation papers indicate that a Seddique Mateen heads a non-profit organization, The Durand Jirga, Inc. The non-profit was formed in 2010 and is registered at the Port St. Lucie, Florida address where both the father and Omar Mateen appear to reside.

Mateen is a U.S. citizen; his parents are from Afghanistan, CBS News reports. FBI Agent Ron Hopper told reporters Mateen may have leanings towards Islamic extremism.

The law enforcement source says there is also no immediate indication that Omar Mateen had any direct connection to ISIS.

The source did not that ISIS recently declared online that its follower s should mount attacks to mark the approach of the holy month Ramadan….