12-year-old girl who suffered third-degree burns in a bus crash in Morocco last week has died, medical officials said Monday, bringing the accident's death toll to 34.

The crash, which saw the bus catch fire after a head-on collision with a trailer truck, was one of the worst in the North African country's history.

Most of the victims were schoolchildren returning from a sports meet.

The girl was taken by helicopter to hospital after the accident but died early on Monday despite several operations, Hicham Nejmi, the head of the Ibn Tofail hospital in Marrakesh, told Morocco's MAP news agency.

Road accidents are common in Morocco, where officials say about 4,000 people are killed each year -- the equivalent to about 11 every day -- in a country of 34 million inhabitants.