The UBS headquarters in London.

Police in London arrested Thursday a UBS trader suspected of making unauthorized trading the previous day that caused Switzerland's largest bank to lose nearly $2 billion.

The arrest of Kweku Adoboli came after UBS announced it discovered the unauthorized trading in its investment bank.
UBS declined to confirm if Adoboli was the fraudster saying the case is under investigation.

The media identified Adoboli through his profile in LinkedIn, a social networking site for professionals, and his Facebook account, which became inaccessible hours after his arrest.

In his LinkedIn profile, Adoboli worked at a UBS desk called Delta One trading in so-called exchange traded funds currently worth more than a trillion dollars. The profile also indicates he worked at UBS's European Equity Trading division for five years and as a trade support analyst for three years.

Adoboli is an e-commerce and digital business graduate of the University of Nottingham in 2003. His residence was a $6,120 per month loft on Brune Street not far from the UBS' UK headquarters.

Adoboli's landlord, Philip Octave, described the man as well-dressed, well-spoken but quiet and always paid up his rent, the Associated Press reported.

Meanwhile, Adoboli's Facebook account photo is that of a man in his early 30s. His interests are indicated as photography, cycling and boutique wines.

With the unauthorized trading, UBS said it may report a loss for the third quarter. But in a letter sent to employees, the bank assured that its fundamental strength will not change.

The arrest of Adoboli caused UBS shares to slid 8.7 percent to $11 on the Zurich Exchange.