1.   Even as the President appealed for calm, trouble flared in several American cities.

2.   The trouble flared just before the final whistle when Maradona tried to stop a Cadiz defender intervening in a dispute over a foul.

3.   But Romney was no sooner introduced when trouble flared again, this time involving an IOC member from the United States.

4.   It was soon after the name of disgraced French striker Cantona was mentioned that the trouble flared.

5.   More trouble flared at the end of the match when police drove back dozens of Manchester supporters who tried to break down exit doors at the stadium.

6.   Sesing said trouble flared at the school Monday morning when white parents chased and threatened television cameramen from the school gates.

7.   Trouble also flared in Oldham, a rough-hewn northern England town that was torn by racial violence last month.

8.   Trouble flared again after a brief afternoon lull, with rioters from both sides attacking police, officers said.

9.   Trouble flared at the school again Monday when white parents threatened television cameramen and chased them from the school gates.

10.   Trouble flared again Tuesday with arson attacks and looting of dozens of Chinese-owned shops.