ISLAMABAD, Pakistan, July 6 (UPI) -- At least 19 people, including 15 police officers, were killed Sunday when a suicide bomber attacked a rally in Islamabad, Pakistan, officials say.

Investigators said the bomber struck at a rally against a 2007 government raid of the capital city's Red Mosque, the Pakistan News Service PakTribune reported.

More than 40 people were injured in the blast with police officers representing most of the victims.

The PakTribune said police reservists appeared to have been the bomber's target and the final death toll was expected to increase as bomb officials search the area.

Nearly 100 people were killed July 10, 2007, when government forces raided the mosque on orders from President Pervez Musharraf. CNN said the raid occurred after radical students took control of the religious site, but several women and children were killed during the government action.

The raid prompted a spate of suicide attacks against both government and civilian targets, the news network said.

Lieberman: Obama 'shifting' on Iraq

WASHINGTON, July 6 (UPI) -- U.S. Sen. Barack Obama, D-Ill., has consistently "shifted" his position on the Iraq war while eyeing the White House, U.S. Sen. Joe Lieberman, I-Conn., says.

Lieberman said Sunday on ABC's "This Week with George Stephanopoulos" that the presumptive Democratic presidential nominee has not been consistent on how best to deal with the war in Iraq.

"Sen. Obama has been shifting. And I want a president who's going to be true to what he believes is best for our country," said Lieberman, a strong backer of Sen. John McCain of Arizona, the likely Republican nominee.

Former U.S. Rep. Bob Barr, R-Ga. -- the Libertarian Party presidential nominee -- told Stephanopoulos he sees both Obama and McCain as very "status quo" based on their political stances.

"Each in their own way is very much a creature of the status quo. Even though Sen. Obama talks about change, the fact of the matter is that he is very wedded, if you look at his programs in terms of socialized medicine and healthcare," Barr said. "Sen. McCain, of course, very much in (the) mold of George W. Bush in terms of more wire-tapping and assaults on individual liberty."

Kerry: Presidential race changing McCain

WASHINGTON, July 6 (UPI) -- Presumptive Republican presidential nominee John McCain is changing as his 2008 campaign goes on, U.S. Sen. John Kerry, D-Mass., said Sunday.

During an appearance on CBS' "Face the Nation," Kerry said he has seen the Arizona senator change his personality and politics during his race for his party's nomination and in preparation for the upcoming general election.

"John McCain has changed in profound and fundamental ways that I find personally really surprising, and frankly upsetting," Kerry said.

"This is a different John McCain. This is not the Sen. John McCain; this is want-to-be president John McCain."

U.S. Sen. Lindsey Graham, R-S.C., appearing on the same program, attacked presumptive Democratic presidential nominee, Illinois Sen. Barack Obama.

Graham, an outspoken McCain supporter, said Obama is wrong to suggest the United States withdraw from Iraq.

"The big test for this country is, how do you avoid losing in Iraq? If we'd have listened to Barack Obama, we would have lost," he said. "If we listen to him now, we will lose in the future and undercut all the gains we've made."

UAE to cancel Iraq's $7 billion debt

DUBAI, United Arab Emirates, July 6 (UPI) -- The president of the United Arab Emirates has agreed to erase all of Iraq's debts to the country, an official said.

UAE Sheik Khalifa agreed to annul Iraq's nearly $7 billion in debt after a meeting with Iraqi Prime Minister Nouri al-Maliki, CNN reported Sunday.

Lawmakers in the Emirates also nominated Abdullah Shieha to serve as the country's new ambassador to Iraq.

An unnamed source said Dubai planned to open its embassy in Baghdad by the end of the year.

Iraq has urged Arab states to expedite efforts to set up their embassies in Iraq.