Taliban fighters in Afghanistan fired on the U.S. Embassy and NATO headquarters in Kabul on Tuesday.
The assault came just two days after America stopped to remember the al-Qaeda terror attacks of 9/11 with memorial services for the victims.
Ten years after U.S. troops invaded Afghanistan, the Taliban appears to be showing renewed strength.
The coordinated attack came from a construction site nearly 1,000-feet from the embassy and nearby NATO headquarters.
"This was one of the largest security breaches that Kabul has ever seen," U.S. Secretary of State Hillary Clinton said.
For several hours, Taliban fighters shot rocket-propelled grenades and automatic weapons toward the embassy, creating chaos in the capital.
At least four Afghans were wounded. No one from the embassy was hurt.
"We will take all necessary steps, not only to ensure the safety of our people, but to secure the area and to ensure that those who perpetrating this are dealt with," Clinton said.
The attack came just three days after Taliban militants set off a truck bomb, wounding 77 American soldiers. It was another reminder that the Taliban's deep roots in the country enable it to strike just about anywhere.
The U.S. and NATO are trying to train the Afghan army to secure the country before the U.S. military's deadline to withdraw from Afghanistan by 2014.
NATO's top leader says the military transition from western fighting forces to an Afghan led mission is still on track.
"We have confidence in the Afghan authorities ability to deal with this situation. As I mentioned in my introduction, we are witnessing that the Taliban tried to test transition, but they can't stop it. Transition is on track and it will continue," said Anders Fogh Rasmussen, NATO Secretary-General.
Meanwhile, while some soldiers prepare to leave Afghanistan, other National Guard firefighters from Westport, Conn. are saying goodbye to their loved ones. They've been helping flood victims of Hurricane Irene and other natural disasters. Very soon, they will be on a one-year deployment to Afghanistan.
Justin Harelick will miss his 6-year-old daughter Nina.
"Just pretty much I'll be helping people out there in the country and it will go by fast, just like a school year for her," he said.
"We've done smaller missions for the state -- emergencies, storms recently and stuff like that. But this is a full year of 24-7, 365 days, no time off, all firefighting, so it's a good experience for everyone," explained Staff Sgt. Dan Nolan.