Several explosions rocked the capital of Saudi Arabia on Monday, apparently targeting buildings that house Western nationals, according to published reports.

Bombs hit at least three different locations in and around Riyadh. "Numerous" people were injured in the explosions, Reuters reported, but there was no immediate word on whether anyone was killed.

At least one explosion happened in Garnata, an eastern suburb of Riyadh, when a car crashed into a residential building there, according to The Associated Press.

Secretary of State Colin Powell is due to arrive in Riyadh on Tuesday. Despite the attacks, Powell does not plan to cancel his trip to Saudi Arabia, the AP reported.

Earlier this month, the State Department warned Americans about traveling to Saudi Arabia, saying it had information that terrorist groups were possibly planning attacks on American interests there.