An advert poking fun at North Korean dictator Kim Jong-un infuriated some officials from the country's nearby London agency.
Tens of thousands line the streets as the annual race widens entry for the first time.
Strict guidelines released in North Korea say all men should have the same haircut as leader Kim Jong-un.
A 30-year-old runner from Stafford has won a half-marathon held in North Korea's capital Pyongyang, after it was opened to foreigners for the first time.
Will Marks, who lives in Shanghai, completed the race in 1 hour 23 minutes, and was among about 150 foreign runners to compete in front of 70,000 onlookers.
Mr Marks stayed in North Korea for three nights before the race on Sunday, but was not allowed to move around the city unaccompanied.
Officials checked participants' running gear several days before the race, and also made sure that hairstyles matched new guidelines that require all men to have short back and sides like President Kim Jong-Un.
An unmanned drone crashed on a South Korean island near the disputed maritime border with North Korea, South Korean news agency Yonhap has reported.
The drone fell on Baeknyeong island on Monday when North Korea fired hundreds of artillery rounds in seas close to a disputed maritime line, triggering a similar show of strength from South Korea in response.
The nationality and purpose of the drone were not disclosed, although Yonhap reported that the South Korean military was looking into any possible link to North Korea's espionage operations.
An unidentified and unmanned aircraft has crashed yesterday on a South Korean island near the disputed sea border with the North, Reuters have reported, citing the Yonhap news agency.
The US has criticised North Korea over its live fire drills, with a White House official calling Pyongyang's recent actions "dangerous and provocative."
China has called for calm and restraint on the Korean peninsula after North Korea and South Korea exchanged fire today.
North Korea fired more than 500 shots during a military exercise near a disputed maritime border with the South, prompting the South to fire back more than 300 shots, South Korea's Defence Ministry said.
South Korea believes the North was testing the South's determination to defend its sea border, the Ministry said.
South Korea has returned fire into North Korean waters after shells from a North live-fire drill fell into the rivals' disputed western sea boundary.
People living on a front-line South Korean island said they were evacuated to shelters during the exchange.
No shells from either side were fired at any land or military installations, South Korea's Joint Chiefs of Staff said.
North Korea desperate for attention again. It"s become an annual event in the Yellow Sea. Worrying though
South Korean marines returned fire after a North Korean artillery shell fell in South Korean territorial waters, Reuters and regional media have reported.
(URGENT) N. Korea's artillery shells fall south of NLL, South fires in response http://t.co/t0a8RZKJ7Q
Artillery shells appeared to have landed in the water north of one of the populated South Korean islands off the west coast of the peninsula but it was not clear whether they fell in South Korean territorial waters, YTN news television said.
(URGENT) S. Korea evacuates border island residents amid NK live-fire drill http://t.co/2CmxD904Au