North Korean leader Kim Jong Un has offered his condolences to the Chinese victims of a deadly bus crash.

A tourist bus fell from a bridge late Sunday south of Pyongyang, killing 32 Chinese tourists and four North Koreans.

Two Chinese survivors are in critical condition in hospital.

Kim Jong Un went to China's embassy on Monday, and also personally visited the surviving Chinese tourists in hospital.

He has sent his condolences to President Xi Jinping as well as China's communist party and government via the Chinese ambassador.

He's also promising full support for treating the injured and coordinating with the Chinese side to handle the crash aftermath.

Chinese President Xi Jinping has also called for a full-scale investigation, dispatching a Chinese working group, including medical experts, to North Korea to help treat the survivors and assist the probe into the incident.

The Chinese Foreign Ministry has expressed China's appreciation for the North Korean leader's visit to the injured Chinese citizens.

A ministry spokesperson says China and North Korea are in close communication and coordination.