Turkish leftist group DHKP-C said it was responsible for a suicide bomb attack on the US embassy in Ankara on Friday, according to a statement on a website close to the group.
"Our warrior Alisan Sanli carried out an act of self-sacrifice on Feb 1, 2013, by entering the Ankara embassy of the United States, murderer of the people of the world," the statement said.
More top news
The inquiry's most senior lawyer is said to be considering stepping down after disagreeing with its chairwoman Alexis Jay over its future.
The tennis superstar said she was being driven by her nephew when she saw a police officer and was worried about what might happen.
A team of prosecutors investigating the downing of a Malaysian airliner over eastern Ukraine in 2014 is due to release new findings today.