A suicide bombing has killed at least 50 people in Quetta, south-western Pakistan, police say.

Nearly 80 others were injured in the explosion at the Shia Muslim rally in the Meezan Chowk area.

Pakistani Taliban militants said they had carried out the bombing.

It was the second attack on Pakistan's Shia Muslim minority this week - bombs in Lahore on Wednesday killed dozens in an attack also claimed by the Taliban.

The bombings come at a time when Pakistan is grappling with unprecedented floods that have displaced millions of people.