Nicolas Maduro speaks at a rally marking the anniversary of the Battle of Santa Isabel, which took place during Venezuela's 19th-century Federal War, in Caracas, Venezuela, Wednesday. (AP Photo/Ariana Cubillos)

WASHINGTON (AP) — President Donald Trump said Wednesday that the United States has seized an oil tanker off the coast of Venezuela as tensions mount with the government of President Nicolás Maduro.

Using U.S. forces to seize an oil tanker is incredibly unusual and marks the Trump administration’s latest push to increase pressure on Maduro, who has been charged with narcoterrorism in the United States. The U.S. has built up the largest military presence in the region in decades and launched a series of deadly strikes on alleged drug-smuggling boats in the Caribbean Sea and eastern Pacific Ocean. The campaign is facing growing scrutiny from Congress.

“We’ve just seized a tanker on the coast of Venezuela, a large tanker, very large, largest one ever seized, actually,” Trump told reporters at the White House, later adding that “it was seized for a very good reason.”

Trump said “other things are happening,” but did not offer additional details, saying he would speak more about it later. When asked what would happen to the oil aboard the tanker, Trump said, “Well, we keep it, I guess.”

The seizure was led by the U.S. Coast Guard and supported by the Navy, according to a U.S. official who was not authorized to comment publicly and spoke on the condition of anonymity. The official added that the seizure was conducted under U.S. law enforcement authority.

Venezuela has the world’s largest proven oil reserves and produces about 1 million barrels a day. Locked out of global oil markets by U.S. sanctions, the state-owned oil company sells most of its output at a steep discount to refiners in China.

The transactions usually involve a complex network of shadowy intermediaries, as sanctions have scared away more established traders. Many are shell companies, registered in jurisdictions known for secrecy. The buyers deploy so-called ghost tankers that hide their location and hand off their valuable cargoes in the middle of the ocean before they reach their final destination.

Maduro did not address the seizure during a speech before a ruling-party organized demonstration in Caracas, Venezuela’s capital. But he told supporters that the country is “prepared to break the teeth of the North American empire if necessary.”

Maduro, flanked by senior officials, said only the ruling party can “guarantee peace, stability, and the harmonious development of Venezuela, South America and the Caribbean.”

Maduro previously has insisted the real purpose of the U.S. military operations is to force him from office.