A security advisory has been issued by the Foreign and Commonwealth Office two weeks after tourists were robbed at gunpoint from an Amazon river boat cruise in Peru.

Eight masked gunmen boarded the vessel and stole goods worth around $20,000 while the vessel was anchored in the middle of the river.

The riverboat had left the city of Iquitos on July 13 with around 30 tourists on board to see towns along the river, local media reported.

None of the mostly American passengers were hurt in the early morning robbery.

In updated travel advice for Amazon cruise ships in Peru, the FCO said: “In July 2016 a cruise ship carrying foreign nationals was robbed while travelling along the River Amazon; security arrangements vary between different cruise operators; contact your cruise ship operator for more information about safety and security on Amazon cruise ships or iPeru (official tourist information and assistance).”