Security has been stepped at synagogues across the US in the aftermath of America’s strikes on Iran.

The US president authorised strikes on Iran’s nuclear infrastructure using 14 GBU-57 Massive Ordnance Penetrators, the largest and most powerful conventional bombs in the US arsenal, over the weekend.

Mr Trump warned in the aftermath of the strikes on Fordow, the country’s primary nuclear site, Natanz and Isfahan, that retaliating would be a mistake.

On Sunday it was revealed the president had been warned at the G7 summit that Iran would activate terror “sleeper cells” across the US in the event of a strike.

Security precautions in the US have been ratcheted up in the wake of the strikes, with Rodney Scott, the customs and border protection commissioner, saying the terror threat had “never been higher”.