Since that point, a number of wild theories have gone around about the crash. Was it really just an accident? Leaked Stratfor emails suggested that Russia may have deliberately sought to delay the flight as a snub to the Polish President — Kaczynski was flying into the country to attend a memorial for the Katyn Massacre (a horrific World War II incident where hundreds of Polish prisoners were killed by their Russian guards) and had angered Moscow by supporting Georgia in the short Russia-Georgia war of 2008.

New reports in Polish media suggest something even darker. Earlier today, daily business newspaper Rzeczpospolita published a report that said the investigation had found signs of TNT and nitroglycerin on the remains of the plane specifically on the wings and in the cabin, including on 30 seats.

The report, which did not cite any sources, has caused huge controversy. However, Rzeczpospolita was soon forced to backtrack, later issuing an editors note that said that TNT and nitroglycerine were not found. What had instead been found was "high ionized components", which may indicate an explosive but are not conclusive.