WATCH: Trump takes cover at rally, rushed off stage | LiveNOW from FOX

Former President Donald Trump's rally is on hold, after "popping noises" sounded off mid-speech. Trump hits the ground, and is escorted away from his event in Butler, PA. It's unclear what the sound was, or if there is any danger. Some photos of the event show former President Trump bleeding from the head area.

This is a developing situation.

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[SpAzZzZz_]

He just won the presidency right here folks.

[nickyjam]

Boy The Simpsons ain't never lied

[Immy_Islam]

Alec Baldwin filming a movie near the rally?😩

[adcurtis]

Where is the footage from all the cell phones? I want to see the footage from behind trump in the crowd.

[Scootertotheshin]

Can't wait to figure out if it was the CIA or FBI this time

[starrtraveler]

Secret services needs to get their act together

[mikesherrard]

You know those follow up shots were the dude going down

[Emo_ian]

The ones shooting r the ones against guns

[lincolnpinkoln]

Security extremely slow to respond...Looks very suspicious...

[matt]

He was less of an inch from being killed.

[dchief]

I used to not like or support the former president but with how bad things are getting I support him and America. As a Native American he’s correct on a lot of issues and America first mindset

[rach]

I wasnt sure who i was goin to vote for ....but the way he responded, we need someone who can maintain composure in crisis.

[jaeahn]

Why secret service is so slow? And they supposed to check all the suspicious points. What the heck!!???

[noahandcadenceadventures]

They are actively trusting to assasinate him

[MileDesertRat]

Popping sounds??? How stupid can these reporters possibly be?

[kandyvenom]

The amount of comments stating they wish the shooter wouldnt have missed is vile in the most degenerate way possible. I hate what our country has become.

[itsjordie]

Shooter was removed from the broadcast!

[bobfisher]

They can't put him in jail so this is the only alternative left for them!

[GlutenFreeGameSnacks]

That’s terrifying even if you aren’t a trump supporter

[GainButLearn-inme]

Why the secret service agent didn't use foldable ballistic shield/vest?