Two former financial advisors at UBS have been indicted by prosecutors in New York for allegedly helping US citizens to conceal $267 million in secret accounts, reports said.

In separate indictments, one of them alleging that a child was used to carry cash to a client, charges were brought against Hans Thomann and Josef Beck. Both live in Switzerland, but they worked separately from each other.

UBS did not respond to this publication's request for comment at the time of going to press.

Thomann was a client advisor at Swiss-based UBS from 1993 to around 2003, then later worked at a series of unnamed Swiss asset management firms, the indictment reportedly said. He helped US clients hide money at UBS and other Swiss banks, including Wegelin, a small Swiss bank that was indicted last month by the Justice Department for selling tax evasion services to US clients, the indictment said.

Thomann handled around 32 accounts holding $138 million for US clients of UBS, and helped around 13 of them transfer their accounts to Wegelin and other Swiss banks when UBS came under pressure from US authorities around 2008, it said.

Thomann also helped clients fleeing UBS transfer accounts to the Swiss branch of an unnamed Israeli bank, it said.

Beck worked at Beck Verwaltungen, an independent advisory firm in Zurich, from the late 1980s to 2010, the indictment said. He managed US client accounts worth $129 million.

Thomann and Beck worked "as full service tax evasion advisors to their American clients who did not want to pay their fair share of taxes," said Preet Bharara, the US attorney for the southern district of New York, in a joint statement with the New York branch of the Internal Revenue Service.

The duo were also charged with "operating unlicensed money transmitting businesses" that funnelled client money between banks and clients.

Neither Thomann nor Beck has been arrested.