[ksutariya]

Right now all the signs are pointing to the exchange owner as the culprit.

Multiple suspicious things occurred prior to this announcement. For example, withdrawals were disabled for all unverified users and those who tried to verify saw that the verification queue was severely backlogged. You could terminate your account but only receive BTC regardless of what other currency(s) you had stored (many users are reporting their accounts were terminated but did not receive any BTC).

Some users reported that there was a bug that caused deposits to be duplicated. Ex: Deposit 1 ETH and the transaction would show up twice in your account therefore making your balance 2 ETH which then you could withdraw successfully.

Disclosure: I had XRB at BitGrail