There were certain indications about who the hackers were, Bangladesh Ambassador John Gomes told a panel looking into how the $81 million in stolen money ended up in the Philippines, citing information shared by the US Federal Bureau of Investigation.

Gomes said the hackers were neither in the Philippines nor in Bangladesh, but he had no other information.

"One of our bank officials who is in the group that makes payments, that passes the payment instructions, his computer was hacked," Gomes said.

"It was a Friday when the attack happened and the Bangladesh central bank is totally shut down. It was all sealed and no one goes to the bank on that day."

There was no evidence directly linking anyone in Bangladesh to the February cyber heist, Gomes said.

Bangladesh's ambassador John Gomes with Philippines Senator Teofisto Guingona Jr.

The hackers sent fraudulent messages, ostensibly from the central bank in Dhaka, on the SWIFT system, to the New York Federal Reserve seeking to transfer nearly $1 billion from Bangladesh Bank's account there.

Most of the transfers were blocked but about $81 million was sent to a bank in the Philippines. It was moved to casinos and casino agents and much of it is missing.

Ralph Recto, one of the Philippine senators leading the investigation, said in April Chinese hackers were likely to have pulled off the heist, citing a network of Chinese people involved in routing the stolen funds through Manila.

China has dismissed the suggestion.

Bangladesh Bank officials have said they believed SWIFT, and the New York Fed, bear some responsibility for the cyber heist, but SWIFT has rejected the suggestion.

The Philippine inquiry has helped recover $15 million of the stolen funds, but the head of the Philippine anti-money laundering council, Julia Abad, said it would take three to five months before the money, now subject of a forfeiture case, could be returned to Bangladesh.

Senators wrapped up their investigation on Thursday but they were nowhere near finding the truth of what happened as they were hamstrung by the country's strict bank secrecy laws and as casinos fall outside the ambit of the anti-money laundering law.