°µÍø½ûÇø

Paramilitary groups in Northern Ireland laid down their arms after the 1998 Good Friday peace accord largely ended three decades of violent conflict between Irish republican and British loyalist groups and U.K. security forces that killed more than 3,600 people. But small Irish Republican Army splinter groups have continued to launch sporadic attacks on security forces.

U.K. Northern Ireland Secretary Chris Heaton-Harris said that “in recent months, we have seen an increase in levels of activity relating to Northern Ireland-related terrorism, which has targeted police officers serving their communities and also put at risk the lives of children and other members of the public.�

He urged people to “remain vigilant but not be alarmed.�

Last month, senior police officer John Caldwell was shot by two masked men as he coached a children’s soccer team in the town of Omagh, about 60 miles (nearly 100 kilometers) west of Belfast. Police say he suffered life-changing injuries.

An IRA splinter group known as the New IRA claimed responsibility.

The change to the threat level comes ahead of events commemorating the 25th anniversary of the Good Friday agreement.

U.S. President Joe Biden is expected to visit Northern Ireland to mark the anniversary. Speaking to reporters Tuesday in North Carolina, Biden was asked if he was concerned about the increased threat level and whether that would affect his plans to visit. “No. They can’t keep me out,� he said.

Major players in the peace process, including former U.S. President Bill Clinton and ex-British Prime Minister Tony Blair, are also due in Belfast for commemorative events.

The threat level for the rest of the U.K. remains at substantial, meaning an attack is considered likely.