"The bank hereby wishes to remind regulated financial institutions that dealing with cryptocurrencies or facilitating payments for cryptocurrency exchanges is prohibited," it said in a statement posted on its website.
Since the assault by security forces, Nigerian authorities have targeted supporters of the protests against police brutality by the disbanded SARS, Amnesty's country director said.
The Agency for the Prevention and Fight Against Corruption (APLC) is investigating allegations by a former Access Bank employee that it laundered money for companies which were under US sanctions.
Access Bank said, an independent audit "did not reveal any anomalies or malfunctions that could confirm these illicit practices".
Health authorities fear Nigeria might not be able to cope with a second wave because of weak health facilities and poorly equipped and unmotivated personnel.
The health minister later in the briefing said Nigeria hoped to start with at least 20 million doses from the Covax facility, initially covering healthcare workers and vulnerable people who would be most at risk if infected, such as the elderly.
The Nigerian Police Force announced in a tweet an investigation into allegations "of crimes committed against citizens", adding "the culprits will be punished".
The attack on Edikwu in the Apa district on Monday, also left several people injured and many houses burnt, said Catherine Anene, the state police spokeswoman.