The Cooperative Bank in Massachusetts is working with the tech startup Carefull to monitor accounts for signs that older clients are being swindled by scammers — including people close to them.

A former Wells Fargo investment advisor stole nearly $3 million from clients and used the money for personal expenses and to buy gold coins, federal prosecutors said.

Account takeovers and ATM skimming are rampant in cities like Las Vegas and New York. Meanwhile, scammers are targeting travelers as they attempt to pay airlines, cruise ships, car rental companies and hotels.

In many cases, stopping fraud in the moment is costly — and any transactions a bank flags incorrectly could alienate its best customers, a Bangor Savings Bank executive said at American Banker's Card Forum.

JPMorgan Chase settled a longstanding French criminal investigation over allegations it helped clients commit tax fraud for 25 million euros ($29.6 million).