Pakistan's officials have said that the extensive damage and loss of life in Quetta was caused by an Improvised Explosive Device (IED) strapped to a motorcycle.
Wazir Khan Nasir, deputy inspector general of police in Quetta, said: "The explosion was caused by an improvised explosive device fitted to a motorcycle."
Here the extent of the damage is being gauged by local people:
More top news
Bodies are being buried in backyards and overwhelming morgues as officials try to find another plot of land to lay them to rest.
Authorities have warned that the death toll is likely to rise as much of the building is yet to be searched.
The PM will sound out the possibility of new free trade agreements with Gulf states for once the UK has left the EU.