One of the world’s largest cryptocurrency exchanges Bitfinex suffered a security threat in 2016 losing many bitcoins.

Some of the stolen bitcoin has been seen being transferred from the wallet that has been holding the stolen BTC to an unknown address.

The discovery was spotted and reported through the Twitter account of Whale-Alert- a crypto transaction tracker on June 7.

The transfer started at 06:08 AM UTC and has been going on. As per press time, there were six completed transactions of about 185 bitcoin which is equivalent to $1.5 million.

So far, it is estimated that the total amount of the moved stolen bitcoins is 0.15% of the 120,000 bitcoins that disappeared in 2016.  By then, the stolen bitcoin was worth $72 million but currently is valued at $973 million.

Anneka Dew a Bitfinex’s marketing director said that the transfer was not in any way linked to processes in Bitfinex as tech publication The Next Web reported.

Bitfinex on May was able to raise $1 billion in its Initial Exchange Offering to support its token. Later, on May 20, the company announced the trading of LEO token which would trade against major crypto asssets.

The UNUS SED LEO is tailored to make trades on Bitfinex easier and it has a valuation of 1 tether (USDT).

Bitfinex noted in the IEO white paper published on May 8 that it was doing everything possible to fully recover all funds that were stolen in 2016.  The exchange in collaboration with U.S. authorities in February this year had successfully recovered approximately 28 bitcoin, (amounting to nearly $104,000 at the time) but the largest amount is still missing.