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From The Professor's Record's Telegram Channel:
The FBI knew in advance the Pulse Nightclub shooter (Omar Mateen) and were tipped off by the local sheriff. 53 dead.

• The FBI knew in advance the Las Vegas shooter (Stephen Paddock). 60 dead.

• The FBI knew in advance the San Bernardino Terrorists (Tashfeen Malik). 14 dead.

• The FBI knew in advance of the Sandy Hook shooter (Adam Lanza). 26 dead.

• The FBI knew in advance the Boston Marathon Bombers (the Tsarnaev brothers) tipped off by Russians. 3 dead, hundreds injured.

• The FBI knew in advance of the Parkland High School shooter (Nikolas Cruz). 17 dead.

• The FBI knew in advance of the Fort Hood shooter (Nidal Hasan). 13 dead.

• The FBI knew in advance of the Boulder Colorado shooter (Ahmad al-Aliwi Alissa). 10 dead.

• The FBI knew in advance the Garland, Texas, shooters (Elton Simpson and Nadir Soofi). 1 dead.