Poland is considering exhuming 90 bodies from a 2010 plane crash in Smolensk, Russia, for a new investigation
The decision will be made by the prosecutor leading the investigation, said Marek Pasionek, the head of the investigation team, the Polish radio station said.
Polish president Lech Kaczynski's plane was attempting a landing at Smolensk, Russia, on April 10, 2010, when it crashed, killing all 96 people on board.
Even six years later, the crash that killed Lech Kaczynski and dozens of other Polish political and military leaders continues to generate conspiracy theories and poison relations with Russia.
Radio Zet reported that investigators want to talk to victims' families, adding that the final decision on the exhumations lay with the investigators.
Poland's national-conservative government doubts that the accident was caused by human error and can call a new investigation.
Jaroslaw Kaczynski, the twin brother of the dead president, is the current leader of the ruling Law and Justice party, which came to power last year.
Many Law and Justice party members remain convinced that the crash was an attack on Lech Kaczynski that has been covered up.
Other Poles believe Russia played a role in the crash because Lech Kacyznski was on his way to a memorial for the victims of the Katyn massacre, where 22,000 Poles were executed by the Soviet secret services in 1943 during World War II, a crime that was covered up for decades.