Thousands of people have attended peace rallies across Northern Ireland, to show their anger at the murders of two soldiers and a policeman.
The soldiers were shot dead as they accepted a pizza delivery at the gates of an Antrim army barracks on Saturday.
Two days later a policeman responding to an emergency call was killed in County Armagh.
Two people, aged 17 and 37, are still being questioned by police over Constable Stephen Paul Carroll's death.
A youth aged 17 and a 37-year-old man were arrested in connection with the shooting in Craigavon on Monday.
Politicians have condemned the killings, and groups which represent workers have organised rallies so people can show that they are against the violence.
Silent protests were held in Belfast, Lisburn, Newry and Londonderry.
One of the organisers in Belfast said he thought around 10,000 people had taken part.
Later, some politicians in London gathered to show their support for the rallies.
A group known as the Continuity IRA has said it shot Constable Carroll, and another group called the Real IRA says it killed the two soldiers on Saturday.
Both groups are known to disagree with the Northern Ireland peace process.
It was set up after 30 years of trouble between some people who believe Northern Ireland should be part of a united Ireland, and others who believe it should stay as part of the UK.