Islamic State vows more attacks on Egypt's Christians

FILE -- In this Dec. 11, 2016 file photo, security forces examine the scene inside the St. Mark Cathedral in central Cairo, following a bombing that killed dozens of people. A 20-minute video from an Islamic State affiliate in Egypt, which emerged Monday, Feb. 20, 2017, showed the suicide bomber who attacked the church and vowed more attacks on the country's Christian minority. The video said Christians are the extremist group's "favorite prey." (AP Photo/Nariman El-Mofty, File) (The Associated Press)

FILE -- In this Dec. 11, 2016 file photo, an Egyptian Coptic nun weeps as she looks at damage inside the St. Mark Cathedral in central Cairo, following a bombing. A 20-minute video from an Islamic State affiliate in Egypt, which emerged Monday, Feb. 20, 2017, showed the suicide bomber who attacked the church and vowed more attacks on the country's Christian minority. The video said Christians are the extremist group's "favorite prey." (AP Photo/Nariman El-Mofty, File) (The Associated Press)

An Islamic State affiliate in Egypt has released a new video showing the suicide bomber who attacked a church in December and vowing more attacks on the country's Christian minority.

The 20-minute video, which emerged Monday, said Christians were the extremist group's "favorite prey."

It showed footage of Abu Abdullah al-Masri, who killed nearly 30 people, mainly women, when he attacked a Cairo church in December. The narrator says the attack was "only the beginning."

Egypt's Coptic Christians, who makes up around 10 percent of the population, have been increasingly targeted by Muslim extremists since the 2013 military overthrow of an Islamist president.