Japan's Nagano Marathon passed off without major incident on Sunday less than a week after twin blasts at the Boston Marathon killed three people and wounded about 180.
"We closed the... gate at 13:30 pm (0430 GMT) without any significant troubles," a member of the organising team told AFP.
Organisers had said more than 650 police and security officers would be involved but this number was unchanged by events in the United States last Monday.
The London Marathon takes place later Sunday amid a heightened police presence in the British capital and will include a moment of silence to remember those killed and wounded in the United States.
World-class athletes and fun runners are to stand in silence for 30 seconds at 10:00am (0900 GMT) before the starter's flag drops on the elite men's and mass races.
US officials said Boston bombing suspect Dzhokhar Tsarnaev remains in serious condition in hospital, unable to answer questions on the devastating attack.
His older brother, Tamerlan Tsarnaev, died after a gunbattle with police.
The Nagano Marathon is held annually in the city that played host to the 1998 Winter Olympic Games.
Around 10,000 runners took part in the event, which started in snowy conditions. Yuki Kawauchi of Japan won the men's race in 2hrs 14min 27sec while Natalia Puchkova of Russia won the women's race in 2:30:40.