At least 30 people have been killed in explosion at a Sufi Muslim shrine in Balochistan, Pakistan officials say.

Hundreds more are reported to have been wounded at the Shah Noorani shrine in Kuzdar district.

Local media report there is no hospital nearby and emergency services are struggling to reach the area because of its remote location.

The injured are reportedly being transported to Karachi on Pakistan's coast for medical treatment.

In October dozens were killed in an attack on a police college in the Balochistan city of Quetta. Another suicide attack killed 70 people at a hospital in Quetta in August.

Nawaz Ali, the custodian of the Shah Noorani shrine, said: "Every day, around sunset, there is a dhamaal (ritual dance) here, and there are large numbers of people who come for this."

Prime Minister Muhammad Nawaz Sharif "strongly condemned" the blast.

In a statement, a government spokesperson added: "The Prime Minister expressed deep grief and sorrow over the loss of innocent lives in the blast.

"Sympathising with the bereaved families, the Prime Minister prayed for eternal peace of the departed souls and grant of courage to the bereaved families to bear this irreparable loss."

This story is developing ...