WASHINGTON — President Barack Obama conceded Wednesday that the U.S. government had let down the families of Americans held hostage by terrorists and promised they would not face criminal prosecution for paying ransoms to captors.

“These families have already suffered enough and they should never feel ignored or victimized by their own government,” Obama said as he detailed the results of a six-month review of U.S. policy.

The president said for the first time that U.S. government officials can communicate directly with terrorists and help families negotiate for the release of hostages. More than 30 Americans are being held hostage abroad, White House officials said.

The review was sparked by sharp criticism of the Obama administration from families of Americans kidnapped by the Islamic State, al-Qaida and other groups. Families have complained about receiving confusing and contradictory information from the government and bristled at threats of prosecution for considering paying terrorists to secure the release of hostages.

By clearing the way for payment of ransom without fear of criminal charges, Obama is essentially allowing families to take actions the U.S. government has long said put Americans at risk. While the government will continue to abide by prohibitions on paying ransoms or making other concessions to terrorists, the Justice Department indicated it would ignore the law in situations involving families.

European governments routinely pay ransom to win the release of hostages. However, Obama and his predecessors have argued that policy provides terrorists with funds to fuel dangerous activities and puts Americans at greater risk of kidnapping.

Critics of the White House review argue that allowing families to do what the government will not could lead to those same troubling consequences.