【Monica Swinn】

UPDATED (4:19 p.m. ET):Updated with additional comment from Shkreli with regards to the substance thrown at him.

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A scheduled joint appearance by nefarious pharma bro Martin Shkreli and Monica SwinnBreitbart writer Milo Yiannopoulos went sideways on Friday due to protests, during which Shkreli was hit in the face by something thrown by a protester.

SEE ALSO: Alt-right troll Milo Yiannopoulos got a big book deal and Twitter is furious

The event, promoted using the hashtag "#SHKRELOPOULOS," was canceled on Friday evening by its organizers, the Davis College Republicans, after protesters blocked access to the venue on the UC Davis campus, according to a statement from the college.

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There was only one arrest, according to the college, though there were plenty of clashes and heated exchanges between protesters and supporters of the two men (both of whom have been suspended from Twitter for violating the site's harassment terms).

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#ICYMI: #MartinShkreli, #MiloYiannopoulos event cancelled at #UCDavis after protests erupt: https://t.co/Of4HfdHPSh. #Shkrelopoulos pic.twitter.com/DXxW36fWnF

— ABC7 News (@abc7newsbayarea) January 14, 2017

Heat between the two sides had been simmering for days before the event, punctuated by an editorial denouncing the event in the school's paper and a petition being circled among students at the school. The school's interim chancellor, Ralph Hexter, said in a statement that the campus would allow the event to go forward to foster "an environment that avoids censorship and allows space for differing points of view."

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And it all came to a head when someone flung a substance at Shkreli on Friday, hitting him in the face.

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Originally reported to be dog poop, Shrkeli denied that, telling Mashablein an email, "There was no poop thrown, unfortunately. This is what they call 'fake news'. There was something thrown--my security determined it to be leaves, which I brushed off. The lack of smell, stain or other obvious findings eliminates the possibility."

As for Yiannopoulos, in a post on his Facebook page, he denounced the decision to cancel the event, saying:

Left-wing thugs scared UC Davis into canceling my event last night by damaging property, hurling excrement at guests and starting fights. It was the university and campus PD who told us the event could not go ahead.

Yiannopoulos also appeared on campus on Saturday with a smaller group of supporters, continuing to criticize the college for canceling his event.

Yiannopoulus was banned from Twitter in July 2016 after an incident stemming from his takedown of the Ghostbustersreboot on Breitbart. It specifically targeted actress Leslie Jones, which led to many of his followers bombarding Jones with vicious, racist harassment. The actress briefly left Twitter during that time, citing that harassment.

The Breitbartwriter also recently signed a six-figure book deal with Simon & Schuster, eliciting backlash from critics and other writers signed to the publishing company.

As for Shkreli, he was suspended for harassing Teen Vogueeditor Lauren Duca after adding several photoshopped images involving he and Duca to his account. According to Twiitter, Shkreli can appeal his suspension and have his account reinstated, so long as he makes necessary changes, including dropping the Photoshopped image of Shkreli and Duca cuddling on a couch.

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