Reuters reports: Egypt said on Saturday it was expelling Turkey’s ambassador and accused Ankara of backing organizations bent on undermining the country – an apparent reference to the Muslim Brotherhood of ousted Egyptian president Mohamed Mursi.

Turkey, which had forged close ties with Egypt under Mursi, responded by declaring the Egyptian ambassador, currently out of the country, persona non grata.

“We are saddened by this situation,” Turkey’s foreign ministry said in a statement. “But responsibility before history belongs to Egypt’s temporary administration which came to power under the extraordinary circumstances of the July 3 coup.”

Turkey has emerged as one of the fiercest international critics of Mursi’s removal, calling it an “unacceptable coup”. Mursi’s Muslim Brotherhood, which has been staging protests calling for his reinstatement, has close ties with Turkish Prime Minster Tayyip Erdogan’s AK Party.