An international delegation including British politicians has been barred from entering the West Bank on a trip to meet Palestinian children, farmers and society leaders facing escalating violence from Israeli forces during olive harvest season.

The delegation of 23 people, including four elected representatives, was drawn from countries including France, Spain, Luxembourg, Switzerland, Greece, Holland, Ireland and the US. It included the Labour MP Clive Lewis, the Scottish National party MP Lara Bird, the Scottish Greens MSP Kate Nevens and the former Labour MP Sam Tarry.

Lewis told the Guardian: “We were detained, taken aside and then interrogated. I use the word interrogated because people were shouted at. We were asked why we were going in, what was happening, why our stories were one way or the other.…