One in three veterans has been arrested, data shows. A commission is asking why.

A think tank says that military veterans are more likely than the rest of the public to be arrested and has launched a new commission to determine why and how the problem can be addressed.

A preliminary report released Tuesday by the Council on Criminal Justice think tank found that about one-third of veterans say they have been arrested at least once, compared to fewer than one-fifth of all nonveterans, citing Justice Department data from 2015.

The report, called the Preliminary Assessment of Veterans in the Criminal Justice System and released Tuesday, also said Justice Department data showed that about 8% of all U.S. inmates, or about 181,500, were military veterans.