Rushan Chagaev of Uzbekistan stunned Cuba's five-time champion and two-time Olympic gold medallist Felix Savon Fabre to win the heavyweight crown at the World Amateur Boxing Championships in Hungary.

The end of the bout was marred when one of the Cuban assistant coaches, apparently angry over the decision, entered the ring and struck referee Garip Erkuyumcu of Turkey, requiring security to intervene and restore order.

The Cubans protested the result, which Chagaev won by a score of 14-4. The Uzbek, who only turned 19 last week, was ahead 4-1 after two rounds but landed several clean punches in the later rounds on his 30-year-old opponent.

The new champion said: "I believe it was a clean bout. It was impossible for the judges to make such a big mistake.

"I met Savon a couple years ago. Now, he did not look so strong. I had simple tactics: get close. It seems he is getting old," he added.