More than 20 people were arrested during the St Patrick's Day celebrations in Belfast.
The PSNI said the arrests, made in the city centre and the Holylands area on Saturday, were for a range of public order offences.
PSNI Superintendent Robert Murdie said an operation was in place to ensure the events in the city went off in a peaceful manner but that "while the majority of people celebrating in the city did so in a good-natured and respectful fashion, some did not heed our message to act and drink responsibly".
Mr Murdie said the majority of those arrested were under the influence of alcohol.
"Police responded to numerous reports of unacceptable anti-social conduct and young people drinking alcohol in the street."
Four people, aged between 18 and 24, have been charged so far and are due before the courts over the next few weeks.
A number of others remain in police custody.
Of those arrested, a 19 year old man is expected to appear before Belfast Magistrates Court on Monday charged with disorderly behaviour and obstructing police.
In April three other men aged 18, 19 and 24 are due in court charged with a number of offences including obstructing police, criminal damage, disorderly behaviour, assault on police and obstruction of a road.