Activists from Britain's Black Lives Matter movement blocked the main road into London Heathrow, Europe's busiest airport, on Friday as part of a nationwide day of protests against racism.
Ten people were arrested during the demonstration, which brought traffic to a standstill at the peak of the holiday season, while another five were held for blocking a road to Birmingham airport in central England, police said.
Black Lives Matter UK had called for a national "shutdown" to mark the fifth anniversary of the police shooting of Londoner Mark Duggan, whose death in 2011 spark several nights of rioting in cities across England.
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The group, inspired by the US protest movement against police shootings of black men, has highlighted British deaths in police custody and the fact that black people in Britain are more likely to be arrested and jailed.
Pictures circulating on social media showed a small number of protesters blocking the link road from a major motorway to Heathrow holding a banner reading "This is a crisis".