A number of people have been killed on the temple mount in recent history:

1982: two people were shot dead

1990: 19 rioters were killed

2017: two policemen, and later 3 rioters were killed

Also, in the past, people were being killed right at the mount:

II Samuel 24:16 And when the angel stretched out his hand upon Jerusalem to destroy it, the LORD repented him of the evil, and said to the angel that destroyed the people, It is enough: stay now thine hand. And the angel of the LORD was by the threshingplace of Araunah the Jebusite.
   I Chronicles 21:16 And David lifted up his eyes, and saw the angel of the LORD stand between the earth and the heaven, having a drawn sword in his hand stretched out over Jerusalem. Then David and the elders of Israel, who were clothed in sackcloth, fell upon their faces.

In 68 AD, the forces resisting the Zealots were killed in the temple by the Zealots and the Edomites.

70 AD, according to Josephus:

"Most of the slain were peaceful citizens, weak and unarmed, and they were butchered where they were caught. The heap of corpses mounted higher and higher about the altar; a stream of blood flowed down the Temple's steps, and the bodies of those slain at the top slipped to the bottom. While the Temple was ablaze, the attackers plundered it, and countless people who were caught by them were slaughtered. There was no pity for age and no regard was accorded rank; children and old men, laymen and priests, alike were butchered; every class was pursued and crushed in the grip of war, whether they cried out for mercy or offered resistance. The Temple Mount, everywhere enveloped in flames, seemed to be boiling over from its base; yet the blood seemed more abundant than the flames and the numbers of the slain greater than those of the slayers. The soldiers climbed over heaps of bodies as they chased the fugitives."

Also, in the first crusade in 1099, when the crusaders took Jerusalem:

"they first burned a synagogue with 300 Jews in it, and proceeded to kill every woman and child who was Muslim on the Temple Mount"

During the tribulation, especially after the placing of the abomination of desolation, how many will be killed in the temple for refusing to worship the image of the beast?

Then, when Jesus returns, what will he do with that abomination of desolation that will have been there for the past 3½ years?

At his first advent, when he cast out the moneychangers, he had suddenly come to the temple.

Malachi 3:1b  and the Lord, whom ye seek, shall suddenly come to his temple,

At the beginning of his ministry:

John 2:13 And the Jews’ passover was at hand, and Jesus went up to Jerusalem,

  14 And found in the temple those that sold oxen and sheep and doves, and the changers of money sitting:

  15 And when he had made a scourge of small cords, he drove them all out of the temple, and the sheep, and the oxen; and poured out the changers’ money, and overthrew the tables;

And at the end of his ministry:

Matthew 21:10 And when he was come into Jerusalem, all the city was moved, saying, Who is this?

  12 And Jesus went into the temple of God, and cast out all them that sold and bought in the temple, and overthrew the tables of the moneychangers, and the seats of them that sold doves,

Will he again come suddenly to the temple, but this time, to destroy the abomination of desolation, and perhaps kill any beast worshippers that may still be hiding there?

.