CAIRO - A quake shook Cairo and other cities in Egypt at 0535 GMT on Tuesday, according to Reuters witnesses and social media postings.

Alexandria, on the Mediterranean coast, and Assiut, in Upper Egypt, were among cities where people said on social media they felt their houses and buildings shaking.

There were no immediate reports of casualties from the authorities.

(Reporting by Lilian Wagdy; Writing by Maher Chmaytelli; Editing by Clarence Fernandez and Christopher Cushing) ((maher.chmaytelli@thomsonreuters.com;))