At least 25 people were killed and another 35 wounded after a bomb exploded in Egypt’s main Coptic Christian cathedral in the capital city of Cairo on Sunday, AP reported. According to the state news agencies, the blast took place near the outer wall of St Mark’s Cathedral, which is the seat of the country’s Orthodox Christian Church and its spiritual leader, Pope Tawadros II.

While the state news agencies said an individual hurled a bomb into a chapel, other reports claimed the explosion may have been caused by a device planted within the chapel. No individual or group has claimed responsibility for the attack so far.

The bombing comes two days after six policemen were killed in a separate explosion in the city. That attack was claimed by a group that called itself the Hasm movement. The group is suspected to have links to the outlawed Muslim Brotherhood, according to Reuters.