At least 25 people were killed when a bomb exploded at largest Coptic cathedral in Egypt's capital city Cairo on Sunday.
Nearly 50 more were wounded in the blast which happened in a chapel adjoining St Mark’s cathedral during a Sunday mass.
There was no immediate claim of responsibility for the attack.
However, supporters of Islamic State, which has carried out deadly attack in Cairo, celebrated the bombing.
The attack marked deadliest on Christians in the country in years. There were many women and children among the victims.
The attack was condemned by several countries and organizations including U.S. and U.N.
Pope Francis said it was the latest in a series of “brutal terrorist attacks.”
The attack comes as Egypt’s Abdul Fattah al-Sisi fights battles on several fronts after taking over as president following a coup in 2013.
The attack was also condemned by the exiled Muslim Brotherhood officials and home-grown militant groups.