President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE traveled to Dover Air Force Base in Delaware on Saturday to meet with the families of four Americans who were killed in an explosion Wednesday in Syria.

Trump announced the trip early Saturday, tweeting that he would be meeting with the families of four "very special people" who died "in service" to the U.S., but offering no further details on the trip.

"Will be leaving for Dover to be with the families of 4 very special people who lost their lives in service to our Country!" Trump tweeted.

Will be leaving for Dover to be with the families of 4 very special people who lost their lives in service to our Country! — Donald J. Trump (@realDonaldTrump) January 19, 2019

Trump was joined Saturday by Secretary of State Mike Pompeo Michael (Mike) Richard PompeoHouse panel halts contempt proceedings against Pompeo after documents turned over Outgoing ambassador to China slams Beijing over coronavirus: 'Could have been contained in Wuhan' Hillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers MORE and acting Defense Secretary Patrick Shanahan Patrick Michael ShanahanHouse Armed Services chairman expresses confidence in Esper amid aircraft carrier coronavirus crisis Boeing pleads for bailout under weight of coronavirus, 737 fallout Esper's chief of staff to depart at end of January MORE, according to the White House press office.

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The unexpected trip comes days after U.S. Central Command confirmed that four Americans, including two U.S. troops, were killed in the explosion in the northern Syrian town of Manbij.

The Pentagon on Friday named the deceased as Army Chief Warrant Officer 2 Jonathan R. Farmer; Navy Chief Cryptologic Technician Shannon M. Kent; and civilian Scott A. Wirtz, a former Navy SEAL working for the Defense Intelligence Agency. The department did not name the fourth American.

Local reports said members of the U.S.-led international anti-Islamic State in Iraq and Syria (ISIS) coalition were caught in a suicide blast in the center of the Kurdish-controlled town.

ISIS has taken credit for the attack through its Amaq news agency, which said an attacker used an explosives-laden vest to target coalition forces.

U.S. and U.S.-backed forces retook Manbij from ISIS in 2016.

The blast comes as the United States begins a drawback of troops in Syria ordered by Trump last month. U.S. forces have begun removing some equipment from Syria, but no troops have yet been withdrawn.

Trump first ordered an immediate withdrawal, but officials have since said the drawback will happen more slowly.

Responding to the attack, acting Secretary of Defense Patrick Shanahan stressed Wednesday that the "fight against terrorism is ongoing."

"Allow me to extend on behalf of [the Pentagon] our thoughts and prayers to the families and team members of those killed today in Manbij," he said ahead of a meeting with Japan's defense minister. "Our fight against terrorism is ongoing and we will remain vigilant and committed to its destruction."

— Updated 10:30 a.m.