British PM’s office says it is a crime to fund a proscribed group after award-winning author promises to back the pro-Palestine group.

The government of the United Kingdom has warned Irish novelist Sally Rooney against funding Palestine Action after she pledged support to the campaign group banned by the Labour-led government as a “terrorist” group last month.

The prime minister’s office said on Monday that “support for a proscribed organisation is an offence under the Terrorism Act” and warned against backing such organisations.

“There is a difference between showing support for a proscribed organisation, which is an offence under the Terrorism Act, and legitimate protest in support of a cause,” a spokesperson was quoted by PA Media.

In an opinion piece in the Irish Times on Saturday, Rooney, the author of best-selling novels such as Normal People and Conversations with Friends, criticised the government’s move to ban the pro-Palestinian group.