TOKYO -- The suspension of a Bitcoin trading platform operated by Tokyo-based Mt. Gox has provoked outrage among panic-stricken customers, highlighting the weakness of a virtual currency that is not regulated by any government or central bank.

Mt. Gox halted all transactions early Wednesday, citing the need to protect its site and users, leaving customers unable to access more than 30 billion yen ($290 million) in assets. The debacle sent the value of the virtual currency plunging.