More than 1,600 account holders in the Texas Department of Transportation toll road system can expect a credit following a cyberattack.

The agency has told the Austin American-Statesman that customer accounts are secure and a total of $46,000 will be credited.

Authorities are trying to identify hackers who from April 6 through April 8 slowed the toll system.

Error messages misled customers who were trying to put more money into their tag accounts, causing them to do several transactions instead of just one. Some accounts ended up being charged more than the necessary amount.

TxDOT spokeswoman Karen Amacker said Thursday that no action is necessary by customers to get the account credit. She says electronic refunds should be completed in a few days.