Five men have been arrested by police investigating an illegal parade and violent disorder in Londonderry on Easter Monday.
Officers came under attack in the Creggan area of Derry, with youths using shopping trolleys to carry petrol bombs and other missiles.
The violence flared at a republican Easter Rising commemoration.
On Wednesday, police searched premises in the Chamberlain Street area of the city.
They detained the five men – aged 29, 31, 42, 45 and 50 – and also seized a number of items.
PSNI Chief Inspector Paul McCracken said: “Immediately after the parade and the attack on local police officers on Monday, we had said that robust action would be taken against those who orchestrated the violence and those who participated.
“These searches and arrests are the first phase of that action and more will follow in coming days.
“Those who seek to attack police and bring violence onto the streets can expect to be held accountable for their actions.”