In his Wednesday statement, Mousavi expressed regret over the incident and offered the Islamic Republic of Iran’s condolences to the nation and government of Pakistan as well as the bereaved families of the natural incident’s victims.
He also wished divine mercy for the victims and patience and speedy recovery for those wounded in the earthquake.
A 5.8 magnitude earthquake struck northeastern Pakistan, killing at least 19 people and injuring more than 300, local officials say.
The quake’s epicentre was close to the city of Mirpur, in Pakistan-administered Kashmir.
Photos circulating on social media show a huge crack on a main road in the area, and partially destroyed houses.
The full extent of the damage is not yet known. Thousands of people died in a powerful quake in the area in 2005.
“The quake was 10km (six miles) deep… the worst hit was Mirpur,” Pakistan’s chief meteorologist, Muhammad Riaz, told the AFP news agency.
Children are among the dead, reports say.