More than 3,000 people were killed in a series of bombings and shootings on Wednesday night in Ireland and Britain, with more than 100 more injured, the British Foreign Office said.
In Britain, police have arrested a man they said was involved in a plot to blow up a busy shopping street, as well as a woman and two children in the northern town of Barking, where at least 30 people were injured.
A British man, in his 20s, was arrested in Barking after he was arrested on suspicion of planning a terror attack, according to the British police.
Britain has also been on high alert since Wednesday night’s attacks, which the government described as “terrorism” and said were carried out by two groups, one of which has links to Islamic State.
The government said the UK has been on alert since the beginning of the week and will continue to monitor the situation.
British Prime Minister Theresa May said on Twitter that the attacks in Britain and Ireland were a “serious threat” and urged the public to “do everything you can to stay safe.”
Prime Minister Jeremy Corbyn said on Tuesday that the threat to the country was “much more than terrorism,” adding that he would be “working with our security partners to protect the British people and our country.”
A man holds a placard during a vigil for those killed in the London Bridge attack, at the Victoria Park in central London, Britain, June 7, 2020.
More: British Prime Minister Jeremy and British Prime Minster Theresa May stand next to each other during a news conference following the announcement of the first suspect in the bombings.
May said that Britain was “absolutely clear” about the threat, which she said was “unprecedented.”
“We know we have to do more, we have got to do a lot more to keep the public safe,” she said.
Britain’s National Security Adviser Michael Fallon said there was “no doubt” that Britain had been “targeted by terrorist attacks” in recent weeks.
“I am not saying this is unprecedented, but it’s certainly the most significant attack in Britain in recent times,” he said.