Difficult conditions frustrate rescue efforts after Turkey and Syria earthquakes as toll reaches 4,300

Rescue teams search for survivors trapped in rubble amid cold and aftershocks following deadly 7.8 magnitude tremor

• Turkey and Syria earthquake: follow latest updates
• What we know so far

Difficult conditions and freezing temperatures hampered rescue efforts overnight in Turkey and Syria, one day after a powerful earthquake struck the region, killing at least 4,300 people.

As the scale of the devastation from the 7.8 magnitude tremor continued to unfold, the World Health Organization warned the number of casualties could exceed 20,000.