A Nigerian man living in the United Kingdom has been sentenced to 10 years for his role in a phishing scam that snatched more than $20 million from over 400 would-be home buyers in the US, including some savers who lost their entire nest eggs.

Late last week, the US Department of Justice confirmed that 33-year-old Babatunde Francis Ayeni pled guilty to conspiracy to commit wire fraud through “a sophisticated business email compromise scheme targeting real estate transactions” in the US.

To seize large down payments on homes, Ayeni and co-conspirators sent phishing emails to US title companies, real estate agents, and real estate attorneys. When unsuspecting employees clicked malicious attachments and links, a prompt appeared asking for login information that was then shared with the hackers.

Once the hackers were in, they could monitor their emails “for transactions where a buyer was scheduled to make a payment as part of a real estate transaction,” then swoop in to send wiring instructions to transfer funds to compromised accounts instead, the DOJ said. To help cover their tracks, co-conspirators then converted the money into Bitcoin on Coinbase.

The scam was seemingly uncovered after co-conspirators targeted a real estate title company in Gulf Shores, Alabama. More than half of the victims were unable to reverse the wire transactions. According to The Record, two victims who shared impact statements in court lost more than $114,000, including a man who “tried to buy his elderly father a home following a Parkinson’s diagnosis.”