Approximately 10 to 12 petrol bombs were thrown at police in Newtownabbey during loyalist disturbances this evening, and a further 19 seized by officers and taken for forensic examination.
"Police came under attack from crowds throwing stones, bottles and petrol bombs following an earlier protest in the area," a spokesman said.
A petrol bomb has been thrown at police during loyalist disturbances linked to the Union flag protest in Northern Ireland.
A PSNI spokesman said officers came under attack north of Belfast in the Newtownabbey area.
Sporadic trouble has erupted for eight weeks linked to Belfast City Council's decision to only fly the flag on designated days like royal birthdays.
A series of protests blocked roads around Belfast tonight but most were non-violent and police said the routes had reopened.