Kabul, Afghanistan ? The deadliest three weeks of violence since the fall of the Taliban has left more than 500 people dead, the U.S-led coalition said Saturday.

The toll included at least 44 deaths last week.

Meanwhile, a top Afghan intelligence agent narrowly survived a bomb attack on his convoy that killed three other people near the capital, Kabul. Fighting elsewhere killed six insurgents and three police on Saturday, officials said.

Much of the recent Taliban fighting is believed funded by the country’s $2.8 billion trade in opium and heroin – about 90 percent of the world’s supply.

The daily violence has raised fears of a Taliban resurgence almost five years after the Islamic extremists were driven out by a U.S.-led invasion for harboring al-Qaida.