The FBI was called Sunday after a loaded gun magazine was found on a Frontier Airlines plane at Hartsfield-Jackson International Airport in Atlanta.

Just after 4:30 p.m. Saturday, officers assigned to the airport responded to a call about a gun magazine found near Frontier Airlines Gate C-6 in Concourse C, according to a news release from the Atlanta Police Department (APD).

A passenger on the Airbus A320 aircraft discovered what appeared to be a loaded magazine containing ten hollow point rounds near seat 7A, according to the release.

Police said the magazine, marked with the initials "K H," was found during boarding for a turnaround return flight to Cincinnati.

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Officers coordinated with TSA, DOA, Frontier Airlines, Homeland Security and Atlanta Police K-9 units, and the aircraft was deplaned, according to the release.

After a thorough search by officers, no additional items of concern were found.

TSA re-screened all passengers, and the flight departed safely just before 8 p.m., according to officials.

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The FBI was notified of the matter, according to APD.

"No active threats were indicated at this time," the agency wrote in the release.

A Frontier Airlines spokesperson told affiliate FOX 5 Atlanta the ammunition belonged to a member of law enforcement who was on an earlier flight.

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"Customers were asked to deplane while a security sweep of the aircraft was conducted, along with additional passenger screening prior to the flight’s departure," the airline told the outlet. "A subsequent investigation confirmed that the ammunition belonged to a law enforcement officer who was on an earlier flight on the same aircraft. The ammunition and magazine were taken into the custody of the Atlanta Police Department and the property owner was referred to Atlanta P.D. to retrieve his items."

However, an APD source told FOX 5 investigators have not confirmed who the magazine belonged to.

"I’ve heard of a lot of delays, canceled flights, but I’ve never heard of this before," passenger Terry Foster told the outlet. "This is brand new."

Another passenger, Janyia Davis, told FOX 5 she didn't feel anyone was in danger, but "something bad could still happen."

Frontier Airlines did not immediately respond to Fox News Digital's request for comment.

The record-breaking U.S. government shutdown appears to be on a path to finally ending after 43 days.

Federal funding legislation aimed at opening the government survived a key test vote in the House later Wednesday, teeing it up for final passage in a matter of hours.

That means the bill could hit President Donald Trump's desk as soon as Wednesday night, likely ending what has been the longest shutdown in U.S. history.

The White House announced that Trump would sign the bill in a statement of administration policy obtained by Fox News Digital.

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"The Administration urges every Member of Congress to support this responsible, good faith product to finally put an end to the longest shutdown in history," the statement said.

The bill advanced through a procedural hurdle known as a rule vote, which is where lawmakers decide whether to allow legislation to get debated before a final vote on passage.

Rule votes generally fall along partisan lines and are not an indication of whether a bill will be bipartisan.

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The vast majority of House Democrats still oppose the bill, but it's possible that at least several moderates will defy their leaders to support it.

House Minority Leader Hakeem Jeffries, D-N.Y., reiterated to reporters hours before the vote that Democrats were frustrated the bill did not do anything about COVID-19 pandemic-era healthcare subsidies under Obamacare, also known as the Affordable Care Act (ACA). Those enhanced tax credits expire this year.

"House Democrats are here on the Capitol steps to reiterate our strong opposition to this spending bill because it fails to address the Republican healthcare crisis, and it fails to extend the Affordable Care Act tax credit," Jeffries said.

House Speaker Mike Johnson, R-La., sounded optimistic in comments to reporters Wednesday morning ahead of the vote.

"I wanted to come out and say that we believe the long national nightmare will be over tonight," Johnson said. "It was completely and utterly foolish and pointless in the end."

Meanwhile, the shutdown's effects on the country have grown more severe by the day.

Many of the thousands of air traffic controllers and Transportation Security Administration (TSA) agents who had to work without pay were forced to take second jobs, causing nationwide flight delays and cancellations amid staffing shortages at the country's busiest airports. Millions of Americans who rely on federal benefits were also left in limbo as funding for critical government programs ran close to drying out.

At the heart of the issue was Democratic leaders' refusal to back any funding bill that did not also extend the enhanced Obamacare subsidies. Democrats argued it was their best hope of preventing healthcare price hikes for Americans across the U.S.

Republicans agreed to hold conversations on reforming what they saw as a broken healthcare system, but they refused to pair any partisan priority with federal funding.

In the end, a compromise led by the Senate — which saw eight Democrats in the upper chamber join colleagues to pass the bill in a 60 to 40 vote — included a side deal guaranteeing the left a vote on extending the enhanced subsidies sometime in December.

Johnson has made no such promise in the House, however.

And the lack of a guarantee on extending those subsidies has angered progressives and Democratic leaders.

"What were Republicans willing to give in the end, other more than a handshake deal to take a future vote on extending the healthcare subsidies?" Rep. Shomari Figures, D-Ala., said Wednesday. "We all know that a future vote is the equivalent of asking two wolves and a chicken to vote on what's for dinner. It is dead on arrival."

The full House will now vote on the legislation during the 7 p.m. hour.

The bill kicks the current federal funding fight to Jan. 30, by which point House GOP leaders said they were confident they'll finish work on a longer-term deal for fiscal year 2026.

"There are nine remaining bills, and we'd like to get all of those done in the next few weeks. And, so, [House Appropriations Committee Chairman Tom Cole, R-Okla.] and his appropriators will be working overtime," House Majority Leader Steve Scalise, R-La., told Fox News Digital.

Asked if he thought they'd get it done by that date, Cole said, "I think we can."