Police in Ankara, Turkey, said the explosion outside the US embassy in Turkey was a suicide bomb, and two people have been killed, the Associated Press reports.
More top news
Joshua Clements stabbed two 19-year-olds while 4,000 people were gathered at the royal park.
The vessel was spotted off the Kent coast at around 5.40am on Thursday.
The US secretary of state called for a new approach to resume talks amid the civil war, including unity government and transfer of weapons.