Three men have been arrested by police under the Terrorism Act following searches of houses in the Coalisland and Cookstown areas earlier today (Wednesday).
The 50, 24 and 21 year-old men were arrested as part of an ongoing investigation following a parade in Derry on Easter Monday.
Police said they had been taken to Musgrave Serious Crime Suite in Belfast for questioning and remain in custody at this time.
The Easter Monday commemoration was organised by republican group Saoradh, and was followed by disturbances during which police officers came under attack.
A further 11 men have already been arrested in relation to the parade.
Ten arrests were made under the Terrorism Act and nine of those arrested were released pending report to the Public Prosecution Service.
Meanwhile, one man arrested for public order offences was charged to appear before court on May 11.