WARSAW, April 21 (RIA Novosti) - Acting Polish president Bronislaw Komorowski has set the date for early presidential elections in Poland for Sunday June 20, the official Polish Parliament website said.

The order was signed at 05:40 local time (03:40 GMT).

Under the Polish constitution, elections must take place within two months after the election date is announced. A second round may be held on July 4.

Komorowski is the presidential candidate of Prime Minister Donald Tusk's governing centrist Civic Platform party (PO).

He was thrust into the role of acting president after the death of President Lech Kaczynski, his wife and a delegation of senior Polish officials in a plane crash near the western Russian city of Smolensk on April 10. The delegation was on its way to pay tribute to some 20,000 Polish officers executed by Soviet secret police in 1940.

The late president and first lady were laid to rest in Krakow on Sunday.

A recent survey by TNS OBOP polling center showed that Komorowski stands a good chance of winning the presidential elections.

In January 2010, Tusk officially declared he would not participate in the presidential elections.

Jaroslaw Kaczynski, the late president's twin brother, who leads Poland's main opposition, right-wing Law and Justice party (PiS), has so far not declared his candidacy in the coming elections, despite Polish media reports that he is supported by many members of his party.