Egyptian security officials say prosecutors ordered a Coptic teacher's detention extended while they investigate her over accusations of blasphemy of Islam and proselytizing Christianity.

Officials say 24-year-old Dimiana Abdel-Nour will be held for another 15 days in the southern city of Luxor where she taught. The defendant, who has denied the charges, went on hunger strike Saturday and was sent to a local hospital.

Separately in another southern Egyptian city, security officials say a Coptic man stabbed his wife for converting to Islam and trying to see their son.

Police say Romany Amir stabbed his wife Saturday in Assiut while she was trying to visit her son at school.

All officials spoke anonymously because they were not authorized to speak to media.