The official death toll in Nepal from a massive weekend earthquake has risen to 3,218, a disaster management chief said on Monday.

"The death toll has reached 3,218 and over 6,500 are injured," said Rameshwor Dangal, who heads the home ministry's national disaster management division.

The toll for Nepal had previously stood at 2,430. Around 90 people are also known to have died in neighbouring countries, including India and China.