BOSTON (AP) — As the nation's opioid crisis was deepening, the company that makes a powerful prescription painkiller considered marketing an anti-addiction drug to "an attractive market" of people with addictions, according to allegations in court documents made public Thursday.

The attorney general's office in Massachusetts is suing Connecticut-based Purdue Pharma, along with some company executives and members of the family that owns it in an effort to hold them accountable for the toll of the drug crisis in the state.

On Thursday, the company lost a legal battle to keep some parts of the la...