Police in the Papua New Guinea province of Oro are facing difficulties getting witness statements over last week's attempt to remove the provincial Governor.
Members of the assembly tried to force a vote against Governor Gary Juffa and replace him with the MP David Arore.
A police complaint has been laid against Mr Arore for allegedly breaking and entering the Governor's office.
But the provincial police commander, Jacob Singura, says being able to effect arrests is proving difficult.
"At the first place, we had people coming out, telling us they witnessed this and that. Then when the interview is in progress, they're withdrawing and they don't want to come out to tell us exactly what they witnessed on the 28th when there was this forced entry into the provincial assembly."
Jacob Singura says five people were arrested and charged in a related matter.
The five, including Oro's former provincial administrator Owen Awaita and former Governor Sylvanius Siembo, tried to break into the provincial administration the day after the attempted ousting of Gary Juffa.