Grzegorz W., the son of former deputy transport minister Eugeniusz Wróbel, has admitted to murdering his father, prosecutors say. Police are still searching for the body.

The family of the former politician notified the police after he went missing around noon on Friday. He reportedly left his house in Rybnik, southern Poland, without a mobile phone or other belongings.

After a thorough search of the woods, local hospitals and shelters over the weekend, police announced on Saturday that they had detained the man's son in relation to the case. On Sunday, the public prosecutor's office confirmed that the man had confessed to the crime, and charged him with murder.

Thirty-year-old Grzegorz W. was the last to see his father alive. The father and son were due to renovate one of the rooms in the house together. According to prosecutors, the son confessed to the crime after being detained and questioned.

“His account was not coherent. The more he said, the more doubts we had. In the end, he admitted to murdering his father,” an officer from the Silesian police was quoted by Dziennik Gazeta Prawna as saying on Sunday.

According to prosecutors, Grzegorz W. admitted to killing his father with a knife and then sinking the body in a water reservoir near Rybnik, where police are still attempting to retrieve it. He declined to answer whether he had outside help.

Polish media is reporting that the father and the son were in conflict for some time, probably about money that the son allegedly wanted to borrow for a trip to the US. Other outlets also say political differences may have been involved.

During a press conference earlier Monday, a representative of the prosecutor's office said that a motive had not been conclusively established yet.

Eugeniusz Wróbel was a deputy marshal of Katowice in 1990-1994, in 2005-2007 he was secretary of state in the ministry of transport in the Law and Justice (PiS) government.