Swiss wealth manager UBS AG (UBSN.VX) (UBS.N) is closing all the offshore accounts of its U.S. clients, the bank said on Friday, as it comes under pressure from U.S. tax authorities.

The Swiss bank decided in July last year to stop offering offshore accounts to U.S. citizens after it was targeted by a U.S. tax investigation which challenges Switzerland's famous banking secrecy laws.

U.S. prosecutors have alleged UBS helped clients hide $18 billion of untaxed American money in undeclared accounts. This amounts to around $300 million of annual unpaid taxes, the newspaper said.nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull