The Philippines has recorded its largest drug seizure in history , sequestering 2,000 pounds of methamphetamine worth nearly $120 million.

The seizures were conducted in a series of raids this month. At 2,000 pounds, the contraband weighs nearly 1 metric ton .

"It is not only the biggest haul for this year, but so far the biggest in history," said Vitaliano Aguirre II, the justice secretary, in Manilla Tuesday.

Aguirre noted that "this is the biggest bust by any enforcement agency." Anti-narcotics operations have led to the arrest of 10 suspects in the case, including three Chinese nationals.

In prosecuting his national drug war, Duterte has openly compared himself to Adolf Hitler , and mused about killing millions.

Some U.S. lawmakers last week wrote the Obama administration questioning the "legalities and appropriateness" of the $32 million in U.S. funding for security forces in the country, in light of recent developments.

"Recipients of our financial assistance must align with our values and ideals, including respect for human rights and the rule of law," Sens. Ed Markey, D-Mass., Chris Coons, D-Del., and Marco Rubio, R-Fla. wrote in a Dec. 22 letter to the State Department's bureau of international narcotics and law enforcement affairs.