The psychoactive drug was intentionally administered in fatal doses, the BBC reported, leading to the deaths of four men: Anthony Walgate, 23; Gabriel Kovari, 22; Daniel Whitworth, 21; and Jack Taylor, 25.

On Wednesday, the 41-year-old Port — who had denied all charges against him — was found guilty of murdering all four men, according to Sky News. Port will be sentenced later this week.

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Port was also found guilty of multiple counts of administering a substance with intent and three sexual assault counts, the BBC reported.

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“Stephen Port is probably one of the most dangerous individuals I’ve encountered,” Detective Chief Inspector Tim Duffield said, according to Sky News.

“He’s a voracious sexual predator who appears to have been fixated, nay obsessed, with surreptitiously drugging young, often vulnerable men for the exclusive purpose of rape.”

“From what we’ve seen as an investigation team, this is a highly devious, manipulative and self-obsessed individual,” Duffield continued. “Throughout both the criminal investigation, many days of police interviews and during the course of a long trial, he has never once shown a shred of remorse for his victims or indeed their families.”

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Grindr, a social media app that assists gay men in organizing face-to-face meetings, did not respond to a request for comment.

The company’s safety tips urge users to be cautious, noting that people should be careful about revealing personal information to strangers and should remember to let a trusted person know where they’re going if they plan to meet someone.

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“If you start out lying, you will eventually get caught,” the company says. “Don’t bait and switch — it’s the surest way for things to end badly. Grindr is not the venue for you to explore your fantasies of being a different person. That’s not fair to the Grindr community, which thrives on honest representations.”

In the United States, the FBI and the Federal Trade Commission have issued warnings about romance scams perpetrated through such apps and dating sites.

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“Millions of Americans visit online dating websites every year hoping to find a companion or even a soulmate,” the FBI said just before Valentine’s Day, adding that “the FBI wants to warn you that criminals use these sites, too, looking to turn the lonely and vulnerable into fast money through a variety of scams.”

London police said Port left his victims’ bodies near a churchyard about 500 yards from his home, the BBC reported. On two occasions three weeks apart, the BBC reported, a dog walker found two of the bodies “lying in the exact same position.”

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Once the killings were carried out, Port went out of his way to cover his tracks by discarding the men’s phones and even planting fake suicide notes, according to Sky News. He also “blocked” one of his victims on Grindr and later deleted the app on his own phone, the BBC reported.

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Last month, jurors listened to the testimony of a 26-year-old man who survived a frightening sexual encounter with Port at his home, according to the BBC. The man told jurors that during a sexual encounter Port twice injected him with a substance, without warning, using a “plastic syringe.”

“On this occasion I jumped off the bed and told him you can’t do that — I’m not comfortable,” the man, whose name was withheld, told jurors, according to the BBC.

The victim testified that Port told him that he’d injected him with a lubricant, the BBC reported. The man said he “started to get dizzy” before deciding he needed to leave Port’s home, the BBC reported.

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Nik Noone, chief executive of the LGBT anti-violence charity Galop, told Sky News: “Our thoughts are with the friends and families of the young men who tragically lost their lives, the survivors that have come forward and those who are affected by the issues raised in this case.

“Our focus now turns to understanding what lessons need to be learned from the police response to unexplained deaths and sexual assault of young men and what must be done to learn how to prevent someone like Port in the future.”

After Port’s conviction was announced, the BBC reported, relatives of Jack Taylor, one of the victims, addressed the media.

“Finally, we have got justice for our Jack,” Donna Taylor, the victim’s sister, said. “He was a true inspiration to everyone who knew him. He was the life and soul of our family.”