The finale of the ITV talent contest saw musician Tokio Myers, 32, take home the prize and it is believed that, for the first time, the judges had enlisted security with weapons.
According to The Sun, show bosses held crisis talks in the wake of the terrorist attack on Manchester last month, which saw 22 killed and many more injured at Ariana Grande's concert.
Sniffer dogs are also said to have been employed in order to detect explosives at the event, with guests having to provide ID and pass through three checkpoints before accessing their seats.
Simon Cowell, 57, remained worried about the potential for terrorist threats against the crowd, telling the publication: "The horrible thing about the Manchester attack is that we have all known this was going to happen, even if there was nothing we could do."
Simon Cowell reportedly had armed police guard the Britain's Got Talent final
Tokio Myers was crowned winner last night Britain's Got Talent: Most memorable moments Mon, May 1, 2017
Britain's Got Talent: The best and worst moments from the ITV talent show.
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Adding that the tragedy had affected him as a father, the Britain's Got Talent boss continued: "We had to ramp things up here, as everyone has seen.
"Years ago a stage invasion was sort of funny," he said, explaining that nowadays that could be much more serious: "One minute it might be eggs thrown, but who knows what it will be next time?"
Express.co.uk has contacted a representative for Britain's Got Talent asking for comment.
Last night, shortly after Britain's Got Talent came to a conclusion, three terrorists drove a van through pedestrians at London Bridge before abandoning the vehicle and stabbing victims.
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Ariana Grande led celebrity tributes to London Bridge attack victims on social media
Simon also spoke out in support of the victims of the London Bridge incident
Ariana is hosting a concert tonight to benefit the victims of the Manchester attack
Seven people were killed in the incident and nearly 50 were injured, with police responding within minutes and confronting and shooting the attackers dead.
Ariana, 23, who has confirmed that tonight's benefit concert for the Manchester attack victims will go ahead "with more purpose" in the wake of the London Bridge tragedy, led celebrity tributes as stars flocked to social media to pay their respects to those affected.
"Praying for London," the popstar tweeted, as the likes of Gordon Ramsay, Cara Delevigne, Ashley James and Bette Midler also followed suit.
Simon also took to Twitter, saying: "Thoughts are with the innocent victims caught up in London Bridge incident. Please try to stay safe people."
One Love Manchester Concert airs tonight at 6.55pm on BBC One.