The trouble followed Tyrone's GAA victory
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A two-year-old boy suffered a cut face after the car he was travelling in was attacked because it was flying a Tyrone GAA flag, police have said.
The toddler was in a car with his mother and grandmother at Hospital Road in Omagh at about 2100 BST on Sunday when a bottle smashed a window.
After the incident, the women were told they would get "more of the same" if they did not take down the flag.
Several people were arrested as trouble flared and rival gangs clashed.
It followed Tyrone's victory over Kerry in the All-Ireland gaelic football final in Dublin on Sunday afternoon.
A petrol bomb, missiles and fireworks were thrown at police in Cookstown and a number of cars were burnt out in the town and in nearby Dungannon.
The police said rival groups clashed in William Street and the Old Town area in the centre of Cookstown on Sunday night.
One car was burned at the scene.
In another incident in Omagh, three men wearing Tyrone shirts got out of a car and assaulted three youths at about 2245 BST.
One of them was taken to hospital and treated for suspected concussion.
Petrol
Earlier in Campsie, police received a number of reports of youths squirting water pistols containing petrol at Tyrone fans.
In Edenaveys, a seven-year-old boy was injured when a brick was thrown at a bus returning from the All-Ireland football final in Dublin.
The boy, from Dungannon, was hit in the face at Newry Road. A 12-year-old girl was treated for shock.
In Dungannon, a car was burnt out and another damaged by fire close to the Stangmore Roundabout on the Moy Road.
Stones were thrown at cars carrying fans returning from the match in Dublin.
Meanwhile, in Strabane a press photographer was attacked as he took pictures of celebrating GAA fans.
He was not badly injured, but his camera was damaged.