The four men were killed in an attack this week on the U.S. Consulate in Benghazi . `` There 's no doubt these are difficult days , '' president says . The White House said the U.S. is prepared to help Ukraine with its economic and political problems. Prime minister says evidence for arrests is based on photos around compound , witnesses . An aide says those arrested are not directly tied to the attacks .
`` There 's no doubt these are difficult days , '' president says . The White House said the U.S. is prepared to help Ukraine with its economic and political problems. Prime minister says evidence for arrests is based on photos around compound , witnesses . An aide says those arrested are not directly tied to the attacks .