It's the shocking tragedy that has convulsed America and the wider world - the worst gun massacre yet committed in the United States.
Details are still emerging about the murder of some 50 people at the Pulse LGBT nightclub in Orlando, Florida, by gunman Omar Mateen (29), and the brutal hate crime has led to an outpouring of shock, grief, anger, fear, and love over the past 24 hours.
Here are some of the most powerful, emotional, and thought-provoking reactions from Twitter, starting with a viral tweet from last June that thousands of people re-shared yesterday due to its depressing topicality.
1)
https://twitter.com/DPJHodges/status/611943312401002496
2)
https://twitter.com/THR/status/742145115418853376
3)
https://twitter.com/jerameykraatz/status/742021630105264128
4)
https://twitter.com/steenfox/status/742050348550868992
5)
https://twitter.com/b2dac/status/742060188648284160
6)
https://twitter.com/Raphaelite_Girl/status/741963676094234624
7)
https://twitter.com/harinef/status/742012750868680704
8)
https://twitter.com/elielcruz/status/742078495233310721
9)
https://twitter.com/gersandelf/status/742008212409327616
10)
https://twitter.com/Ankaman616/status/742006461115555840
11)
https://twitter.com/kiaspeaks/status/742001535345950720
12)
https://twitter.com/jeonwonwwoo/status/742029600243355649
13)
https://twitter.com/hanifleylabi/status/742129845577076736
14)
https://twitter.com/wilw/status/742084037053800448
15)
https://twitter.com/Tweet_Dec/status/742288379958722560
16)
https://twitter.com/KieseLaymon/status/742020344203075584
17)
https://twitter.com/RheaButcher/status/742013077504200704
18)
https://twitter.com/ClaudiaKoerner/status/742073788880195585
19)
https://twitter.com/Tweet_Dec/status/742260634893570048
20)
https://twitter.com/TUSK81/status/742033388769419265
21)
https://twitter.com/JamesMelville/status/742014055985090560
22)
https://twitter.com/jk_rowling/status/742224187369107456
23)
https://twitter.com/JamilSmith/status/742047875484549120
24)
https://twitter.com/BobbyBigWheel/status/742005327168671744
25)
https://twitter.com/Hajabeg/status/742023266936590337
26)
https://twitter.com/rachel_is_here/status/742004660928647168
27)
https://twitter.com/cschleichsrun/status/741982582531723265
28)
https://twitter.com/DavidKlion/status/741981530952769536
