At least 59 people were killed and over 150 were wounded in a suicide bombing at a mosque in Pakistan on Friday, according to Pakistani officials.

The attack occurred during Friday prayers in the town of Quetta, in the southwestern province of Balochistan. The Pakistani Taliban has claimed responsibility for the attack.

The bomber reportedly targeted police officers who were providing security at the mosque. At least 44 people were killed and 150 were injured in the blast, according to provincial home minister Ziaullah Langove.

The attack is the deadliest in Pakistan since 2014, when more than 150 people were killed in a school in the city of Peshawar.

The attack has been condemned by international leaders, including UN Secretary-General Antonio Guterres, who said in a statement that he was “appalled” by the attack.

The Pakistani government has vowed to take “strict action” against the perpetrators of the attack and has launched an investigation into the incident.

This is a developing story. Check back for updates.