Switzerland's UBS AG agreed Wednesday to pay some $1.5 billion in fines to international regulators following a probe into the rigging of a key global interest rate.

In admitting to fraud, Switzerland's largest bank became the second bank, after Britain's Barclays PLC, to settle over the rate-rigging scandal. The fine, which will be paid to authorities in the U.S., Britain and Switzerland, also comes just over a week after HSBC PLC agreed to pay nearly $2 billion for alleged money laundering.

The settlement caps a tough year for UBS and the reputation of the global banking industry. As well as being ensnared in the industry-wide investigation into alleged manipulations of the benchmark LIBOR interest rate, short for London interbank offered rate, UBS has seen its reputation suffer in a London trial into a multibillion dollar trading scandal and ongoing tax evasion probes.

Other banks are expected to be fined for their involvement in the LIBOR scandal. LIBOR, which is a self-policing system and relies on information that global banks submit to a British banking authority, is important because it is used to set the interest rates on trillions of dollars in contracts around the world, including mortgages and credit cards.

Britain's financial regulator called the misconduct by UBS "extensive and broad" with the rate-fixing carried out from UBS offices in London and Zurich.