The anti-American sentiment, always high in Pakistan, was evident in the crowd that waved banners saying "Down with America," and "The friend of America is the traitor of the nation."
Pakistan's tribal regions, such as North and South Waziristan, border Afghanistan and serve as bases for militant groups such as the Taliban to stage raids across the border into Afghanistan.
The protest convoy of about 150 cars set out on Saturday from the capital Islamabad, traveled 250 miles and then stopped overnight in the city of Dera Ismail Khan. The plan for the second and final day was to travel another 70 miles to reach Kotkai in South Waziristan. But the military stopped the convoy in the town of Kawar.
Khan told the rally that they wanted to continue their journey to Kotkai, but the army said it was too late, and going inside South Waziristan at night was dangerous. Khan said he didn't want to put his supporters in danger, so he turned the rally around to Tank.
A spokesman for Khan's Pakistan Tehreek-e-Insaf party in Khyber Pakhtunkhwa province, Umar Younus, said the army stopped the convoy at a checkpoint and despite insistence by PTI leaders they would not allow the convoy to go any farther.
Regardless of whether he was able to enter the tribal region, Khan portrayed the two-day motorcade as a success.
"We have taken the voice of the people of Waziristan to the world," he said.
Thousands of supporters had turned out along the route to cheer on the convoy, which stretched about 15 kilometers (9 miles), including accompanying media. Some of those packed into the vehicles waved flags forKhan's political group and chanted: "We want peace."