Immigration and Customs Enforcement has removed the last 18 detainees from Guantanamo Bay, Cuba, emptying the detention site of all illegal immigrants.

The 18 men who were awaiting deportation were transferred on a charter flight to the United States on Wednesday, the New York Times reported. It remains unclear to where they were flown, but this has been a common practice for the Department of Homeland Security, wishing to consolidate mass deportation flights amid the Trump administration’s crackdown on illegal immigration.

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The Washington Examiner contacted the Department of Homeland Security and ICE for comment on the move.

After taking office in January, President Donald Trump expanded the use of the existing migrant detention site on the U.S. naval base to house illegal immigrants for deportation purposes. Trump envisioned it would hold 30,000 people, but the site never reached its current capacity of 2,500.

Since then, about 700 immigrants have been detained there at different times.

In February, ICE removed 178 Venezuelan nationals from Guantanamo — the highest number of immigrants being held there at once. All but one were sent to Honduras, where they could catch a connecting flight to Venezuela. The sole detainee not flown back to Venezuela was sent to a U.S. immigration detention facility.

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One month later, ICE moved 40 immigrants from Guantanamo to stateside facilities in Louisiana, the reason for which was unclear.

The infamous detention site has been used to hold suspected terrorists since then-President George W. Bush initiated the war on terrorism. Before then, it held thousands of Haitian asylum-seekers fleeing their island-nation because of a coup d’état in the early 1990s.