Turkey's interior minister said the suicide bomber in today's deadly attack at the US embassy in Ankara belonged to an illegal leftist group, Reuters reports.
Turkish state broadcaster TRT said the bomber was 30-year-old and used plastic explosives in the attack.
The bomber is believed to have spent time in prison on terrorism-related charges, and was a member of the Revolutionary People's Liberationi Party-Front (DHKP-C), TRT said.
More top news
Transport Secretary Chris Grayling believes Network Rail should share the responsibility with private train operating companies.
Two vehicles were swallowed up by the sinkhole on Sunday night, killing Dora Linda Nishihara and injuring one man.
Elliott Livingstone, aged three, spent most of his life in hospital before the operation in April.