Turkey urged the UN Security Council to take the "necessary action" to stop Syrian aggression after a mortar bomb fired from Syria killed five Turkish civilians.
A letter obtained by Reuters said:
This is an act of aggression by Syria against Turkey. It constitutes a flagrant violation of international law as well as a breach of international peace and security.
More top news
A 14-year-old boy has been charged after a man was shot dead and three people were injured in a shooting at a US primary school.
Sunshine with blustery showers and longer downpours
The founder of a free school and two ex-staff members have been jailed for defrauding the Department for Education of thousands of pounds.