CAIRO — Egypt faced the prospect of a surge in sectarian bloodshed on Tuesday after the Islamic State claimed responsibility for the bombing of a Coptic cathedral in Cairo that killed 25 people on Sunday. The group warned of more attacks to come.

As Christians gathered in churches to pay their respects to the victims, most of them women, the Islamic State said it had sent a suicide bomber to the chapel on the grounds of St. Mark’s Coptic Orthodox Cathedral, the seat of the Egyptian Orthodox Church.

The Islamic State, also known as ISIS or ISIL, identified the bomber by his nom de guerre, Abu Abdallah al-Masri. The Egyptian authorities on Monday identified the attacker as Mahmoud Shafik Mohamed Mostafa, but said he had used a different alias. ThereLiow said the pregnant woman was admitted to Malacca Hospital on Tuesday with influenza-like illness (ILI).

"Doctors realised that her unborn baby was exhibiting fetal distress. The woman was treated with Tamiflu while surgeons delivered the baby by Caesarean section.

"The woman subsequently suffered complications and was placed in the intensive care unit. She died on Friday.

"The newborn, who is in a stable condition, has tested negative for H1N1."

The woman was identified as Sumarni Mah Nor. The woman's 54-year-old mother, Maimunah Dimah, a diabetic, was also suffering from H1N1. She died in the same hospital on Tuesday.

Both the victims were buried at the Muslim cemetery in Sungai Mati in Muar, Johor.

"The two deaths clearly show how important it is for people in the high-risk category to seek treatment the moment