An Indiana state court judge and his wife were in stable condition on Monday as authorities continued to search for suspects who shot the couple the day before at their Lafayette home.

Steven Meyer, a Tippecanoe superior court judge, suffered an injury to his arm and his wife – Kimberly Meyer – had a hip injury from the attack, authorities said.

Officers responded on Sunday afternoon to a report of a shooting in the residential area about 60 miles (96km) north-west of Indianapolis to find the couple injured. They were treated for their wounds, and officers recovered shell casings from the scene.

Lafayette police said the investigation remains active and involves local, state and federal agencies. They have not released a motive or suspect description.

The mayor, Tony Roswarski, assured the community that every available resource was being used to apprehend the person or people responsible for what he called “this senseless unacceptable act of violence”.

Kimberly Meyer said in a statement on Monday that she had “great confidence” in investigators and was grateful to the officers and medical professionals who helped her and her husband.

The shooting had other Indiana judges worried for their safety, with Loretta H Rush, a state supreme court chief justice, urging them to “please remain vigilant in your own security”.

“I worry about the safety of all our judges,” she wrote in a letter to the state’s judges. “As you work to peacefully resolve more than 1 million cases a year, you must not only feel safe, you must also be safe. Any violence against a judge or a judge’s family is completely unacceptable.”