Law enforcement are piecing together on Monday what happened at the Pulse nightclub in Orlando.

President Barack Obama on Monday said the shooter, Omar Mateen, appeared to have had no contact with ISIS leaders, but rather was radicalized by exposure to ISIS propaganda over the internet. Law enforcement confirmed that Mateen declared his allegiance to ISIS during an interaction with law enforcement during the early Sunday morning standoff.

Here's what else we know about the incident.

• Authorities on Monday clarified that the death toll — 50 — included 49 victims and the shooter. Some 29 patients remain in area hospitals, with five patients in "grave" condition.
• Shooter Omar Mateen had at least two previous encounters with the FBI, none of which led to substantiated allegations.
• Mateen legally purchased a 9mm handgun and an AR-15. Those were the weapons he used during his rampage.
• The City of Orlando is slowly releasing the names of the victims; 35 of 49 have been released so far. Here's a little of what we know about the victims.
• How Muslim Americans have reacted to the shooting: 

• Sunday night at the Tonys, Lin-Manuel Miranda delivered a sonnet for Orlando during his acceptance speech.
• Monday morning, stocks of gun manufacturers rose higher, signaling that markets, at least, believe the shooting will be good for the gun business.
• In the US, men who have sex with men can't donate blood, which provoked anger in the wake of the Orlando attack.. But that's not the case in other countries: