A British woman earlier told the BBC conditions on the boat were “starting to deteriorate”.
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Around 70 tourists on a river boat in Peru have been detained by an indigenous group as part of a protest against a recent oil spill.
The UK Foreign Office says a “very small number” of British nationals – believed to be three – are on the boat.
Peruvian, Swiss, American, Spanish and French nationals are also believed to be on board.
One British passenger, Charlotte Wiltshire, said the group was starting to run out of food and water.
“Conditions are starting to deteriorate,” she said in a message sent to the BBC.
She has asked for an “intervention to get us out of here”, saying there were pregnant, diabetic, elderly and sick people on the boat.
The tourists are not thought to have been harmed. They have been held since Thursday morning.
Activists from the Cuninico community released a statement earlier in the week saying that from midnight on 1 November, no boats or vessels would be able to pass.
“We demand that the government talks to the Cuninico community or face consequences – the ultimate responsibility lies with the President of the Republic [Pedro del Castillo]”, the statement read.
Speaking to a local TV station, Prime Minister Anibal Torres appeared to blame the Cuninico community itself for cutting the pipeline.
The community refused to participate at a meeting with a delegation sent by Peru’s prime minister on Friday, it has been claimed.
One Peruvian passenger on the boat, Regina Mortua, said they were stranded at the mouth of the Cuninico River.
“A few minutes ago the native community decided to take our [tourist] boat close to their town,” she said.
“A few hours ago another boat came for us to board, however it was not possible, because it only transports food…
“They have just informed us that possibly at night they will transfer all the passengers in boats. However, no passenger wants to leave their belongings.”
Another tourist told local TV the group had been fed, but had been told they would be held for up to eight days, if there was no resolution.
The UK Foreign Office said: “We are in contact with the local authorities and a very small number of British nationals involved in an incident in Peru.”
The oil spill that sparked the protest from Cuninico’s indigenous community happened on 16 September, and protests began later that month.
