There are reports coming in of a suicide bombing attack in Kabul, Afghanistan with 50 people killed or wounded.

UPDATE: 3 suicide bombers in Kabul: 1st detonated explosives, 2nd vest was defective & 3rd bomber killed by officers – @TOLOnews

— Conflict News (@Conflicts) July 23, 2016

According to BBC:

Police are reportedly ferrying injured to hospital after the blast in Deh Mazang square.

Thousands from the Hazara minority had been marching to demand changes to the route of a planned power line.

They are angry that the planned route bypasses areas with large Hazara populations.

The cause of the explosion remains unclear, although Tolo news cited unconfirmed reports that a suicide bomber had carried out the blast.

A large part of the city centre had been sealed off for the protest march.

The demonstrators had waved banners and chanted “death to discrimination”, angry that the 500kV power transmission line from Turkmenistan to Kabul would not pass through Bamyan and Wardak provinces, which have large Hazara populations.

This story is developing and will be updated as new information becomes available.

UPDATE: The death toll has risen to 61, while 207 are wounded according to the Afghan public health ministry.