Baghdad, Iraq ? Three explosions rocked the heavily fortified presidential palace compound Tuesday night where many U.S. officials live and work, wounding four people in the second such attack on the complex in the Iraqi capital in 10 days.

Capt. David Romley of the Pentagon said the blasts probably were caused by mortar rounds launched into the compound. He said it was not known whether the injured were soldiers or civilians. It was not immediately clear whether any were Americans.

On Oct. 26, insurgents fired projectiles into the 1-square-mile compound, hitting the al-Rasheed Hotel, which is home to many American soldiers and civilian officials in the U.S.-led occupation administration. That attack, carried out with at least eight rockets, killed one person and wounded at least six others.

In other violence Tuesday, two more coalition troops were reported slain. In Baghdad, one U.S. soldier died and two were injured in a roadside bombing. The military said all were from the 1st Armored Division, but their names were withheld pending notification of their families. In southern Iraq, British officials said Cpl. Ian Plank, 31, was killed Friday by hostile fire.

The continuing danger is prompting Spain, a close U.S. ally that has contributed more than 1,000 troops to the coalition forces in Iraq, to withdraw most of its diplomatic staff from Baghdad.

President Bush on Tuesday reiterated his pledge to go after those attacking coalition soldiers and civilians in Iraq.

“We will continue to find the terrorists and bring them to justice. These people want to — ‘these people’ being the terrorists and those who would kill innocent life — want us to retreat, they want us to leave, because they know that a free and peaceful Iraq in their midst will damage their cause,” Bush said Tuesday while touring damage from the wildfires in California. The United States, he added, will “stay the course.”

Generally, the insurgents’ mortar attacks have not been terribly accurate, although one attack in August on the U.S.-protected Abu Ghraib prison west of Baghdad killed six Iraqis and wounded nearly 60 others.

In addition to mortar attacks, assassinations of public figures are a growing concern. On Tuesday in the northern city of Mosul, a judge was slain a day after a judge in the southern city of Najaf was abducted and executed.

The Najaf jurist, Najaf Muhan Jabr al-Shuwaili, was behind the creation of a judicial commission to probe former officials of Saddam Hussein’s ousted regime.

Amid the violence, Jalal Talibani, the current chairman of Iraq’s Governing Council, wrote a letter to the U.S. government on behalf of the 24-member council extending their condolences and condemning the “terrorist attacks” that brought down a U.S. helicopter Sunday in Iraq, killing 15 soldiers.

“The attacks are obvious proof of the disappointment and frustration” of the anti-American forces because of Iraq’s “development and accomplishments,” the letter said.

However, the letter went on to urge the U.S.-led occupation administration to turn over more of the responsibility for the country’s security to the governing council.

“We believe Iraqis are more capable to deal with this … than others, since they are well acquainted with the current state of affairs in Iraq and very aware of the … nature of their people,” the letter said.