Turkish authorities are investigating some 10,000 people on suspicion of using social media to support terrorism, the interior ministry said on Saturday, part of a wide crackdown that has alarmed rights groups and some Western allies.

Turkey's ruling AK Party on Saturday submitted to parliament a package of constitutional reform proposals that would expand the president's powers, party officials said, in a move that could potentially see President Tayyip Erdogan govern until 2029.

Tayyip Erdogan accused Europe of abetting terrorism by supporting Kurdish militants and said he did not care if it called him a dictator.