Police have fired water cannon and tear gas to disperse a crowd of several thousand protesters in the Turkish town where 284 people were killed in a mining disaster.
A Reuters witness said people scattered into side streets as police moved in after a stand-off on a shopping street in Soma, which also included the offices of the local government and labour union.
More top news
Police have stepped up patrols after the suspected targeted attacks.
The royal couple will carry out their first official engagements as husband and wife on Tuesday.
Flights from UK airports were an average of 15 minutes late in 2017.