Police were attacked while dispersing a large crowd from a Co Down beach.
Four youths were arrested after officers were called to clear a gathering of around 200 from Ballyholme beach near Bangor on Friday night.
A Police Service of Northern Ireland (PSNI) statement said: One police officer was injured after she was kicked in the face.”
A 17-year-old youth has been charged with offences including assault on police and is expected to appear at Newtownards Youth Court on June 23.
Two others, a woman aged 18 and a 16-year-old boy, have been released to be reported to the prosecutors, while a 15-year-old boy remains in custody.
Assistant Chief Constable Alan Todd said: “I understand that as time goes on, and with the current spell of good weather, some people may be tempted to get out and about and make the most of the sunshine.
“However, as a police service, our key role is to support our public health colleagues and the Northern Ireland Executive to ensure we all play our part in stopping the spread of the virus and help save lives."