At least 200 police officers from the British mainland arrived in Northern Ireland on Thursday as violent protests continued.
Police Scotland was expected to send around 90 officers, including five inspectors, under a mutual aid agreement with the Police Service of Northern Ireland.
Officers have also been sent from the North West and North East of England, according to a police source, however forces declined to say for operational reasons whether they were participating.
Belfast was braced for more disruption on Thursday night, as businesses closed and trains and buses stopped from 6pm.
It comes after a second night of violence on Wednesday in which
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