A group of men recently arrested in Britain had been planning an attack, officials said, a development likely to ramp up tensions between Israel and Iran.

The Israeli embassy in London was the alleged target of five Iranian men arrested on suspicion of preparing an act of terrorism, the BBC understands. Police have not yet confirmed that the embassy in Kensington was the suspected target, as first reported by the Times, citing operational reasons. But the BBC understands the report is accurate.

Eight Iranian nationals who were arrested in coordinated raids across the UK are suspected of plotting an attack on the Israeli Embassy in London, according to The Times. British authorities remain tight-lipped.