Explosions and low-flying aircraft were heard early Saturday in Caracas, Venezuela. The government has accused the U.S. of attacking civilian and military sites. The Pentagon referred comments to the White House, which hasn't responded. The FAA has banned U.S. flights in Venezuelan airspace due to military activity. Smoke rose from a Venezuelanmilitary base hangar, and another installation lost power. Residents rushed to the streets, feeling the ground shake. Venezuela's government urged supporters to mobilize against what it calls an imperialist attack. This follows U.S. military actions targeting alleged drug-smuggling boats and ongoing tensions over Venezuela's oil reserves.