LONDON -- International Olympic Committee president Jacques Rogge won't budge: There will be no minute's silence for the Israeli victims of the 1972 Munich massacre at the opening ceremony of the London Olympics.

Rogge rejected the latest calls Saturday for a special observance to commemorate the 40th anniversary of the murder of 11 Israeli athletes and coaches by Palestinian gunmen at the Munich Games.

"We feel that the opening ceremony is an atmosphere that is not fit to remember such a tragic incident," Rogge said.

The IOC has come under pressure from politicians in the United States, Israel and Germany to pay tribute to the slain Israelis during Friday's ceremony.

Rogge said the IOC will honor them at a reception in London during the Games on Aug. 6. He said IOC officials also will attend a ceremony in Germany on the anniversary of the attack on Sept. 5 at the military airfield of Furstenfeldbruck where most of the Israelis died.

Rogge also noted that he has attended several ceremonies with the Israeli Olympic Committee and Israeli athletes during recent Games.

"We feel that we are able to give a very strong homage and remembrance for the athletes within the sphere of the national Olympic committee," he said at a news conference. "We feel that we are going to do exactly the same at the exact place of the killings at the military airport near Munich on the 5th of September, the exact date."

During the second week of the Munich Games, eight members of the Black September militant group penetrated the laxly secured Olympic Village and took Israeli team members hostage. A day later, all 11 were dead. German police killed five of the eight assassins during a failed rescue attempt and Israeli agents tracked down and killed the others.

The Israeli and German foreign ministers and the U.S. House Foreign Affairs Committee have urged the IOC to observe a minute's silence.

President Barack Obama also supports the campaign for a minute's silence, White House National Security Council spokesman Tommy Vietor told Yahoo! News in an email Friday.

Rogge was asked whether he was swayed by Obama's view.

"We also pay big attention to recommendations coming either from the political world, or cultural world, or world of enterprise," Rogge said. "And we take then a decision taking into consideration (those recommendations). I will not say that we are necessarily following the advice, but we take it into consideration, yes."

On Sunday morning, a memorial event will be held in east London attended by London mayor Boris Johnson and Efraim Zinger, head of Israel's Olympic committee.

On another issue related to Israel, Rogge said the IOC would investigate any athletes who pull out of competing against Israelis in London claiming they were injured. In the past, athletes from Iran have withdrawn from Olympic events that included Israelis without facing sanctions.

"If an athlete is genuinely injured or ill, then of course it is understandable," Rogge said. "But we will examine every case very thoroughly and we will examine every case with an independent medical team. If the medical team does not ratify the decision of the first doctor, then the athlete will be punished."

Rogge said the IOC has reminded all national Olympic committees, not just Arab bodies, that refusing to compete against another competitor is "totally forbidden by the Olympic Charter."