SEOUL, April 27 - A North Korean defector tried to set himself on fire to halt the Olympic torch relay through Seoul, while thousands of police guarded the flame Sunday from protesters blasting China's treatment of North Korean refugees.
The torch relay has become a lightning rod for anti-China demonstrations. At other stops, protesters have focused their ire on Beijing's recent crackdown on anti-government riots in Tibet. But in South Korea, China's treatment of North Korean defectors has taken center stage.
Thousands of North Koreans, fleeing lives of hardship in a country that restricts all civil liberties, have escaped across the loosely controlled Chinese border, rather than attempt the heavily fortified frontier with the South. Many live in hiding in China, where if caught, they are deported back home to face imprisonment in life-threatening conditions.

The man who tried to immolate himself, 45-year-old Son Jong Hoon, had led an unsuccessful public campaign to save his brother from execution in the North, where he was accused of spying after the two met secretly in China. About an hour into the relay, Son poured gasoline on himself and tried to light himself on fire, but police stopped him.

At the start of the relay, a protester rushed toward the Olympic flame and tried to unfurl a banner calling for China to respect the rights of North Korean refugees.
Scuffles broke out near the park between a group of 500 Chinese supporters and about 50 demonstrators. The Chinese side threw stones and water bottles at the others as some 2,500 police tried to keep the two groups apart.

A rock hit a journalist in the head, but there were apparently no other injuries.