Oil spills from the Keystone pipeline have become more frequent and severe, a federal agency said.

For the first time in a week, crude oil is flowing again through most of the 2,687-mile Keystone Pipeline following a major leak in Kansas, officials said.

It was the largest onshore crude oil spill in nine years.

A federal report released last year revealed there were 22 accidents from the pipeline between 2010 and 2020.

It's a system that transports crude oil from Canada to the United States.

Officials worked over the weekend to mitigate the fallout from the Keystone Pipeline rupture that leaked about 14,000 barrels of crude oil into a Kansas creek.

A look at the numbers behind the Keystone Pipeline leak and its potential impact on gas prices.

Investigators said they don't immediately know what caused the spill in Kansas.

Randy Hubbard, emergency management preparedness coordinator for Kansas' Washington County, addresses how officials are working to clean up the spill.

Chris Pannbacker’s farm in Washington County, Kansas, has been impacted by the oil spill from the Keystone XL Pipeline, which is now being investigated.

Meanwhile, Congress is racing against the clock to fund the government and avoid a shutdown before the Dec. 16 deadline.

ABC News’ Alex Perez reports on the race to repair the pipeline that spilled nearly 600,000 gallons of oil into the creek and the federal investigation to determine what went wrong.

TC Energy and the Department of Transportation are conducting investigations into a pipeline rupture that caused a crude oil spill in a Kansas creek.

Crews are working to clean up the oil spill which sent nearly 600,000 gallons of oil into a creek in Kansas.

The system was shut down after an oil leak released an estimated 14,000 barrels into a creek in rural Kansas.

The issue stems from new legislation meant to punish "riot boosting."

The company said the pipeline was shut down at 6 a.m.

The White House announced today it has signed off on the Keystone XL oil pipeline, authorizing the Canadian company behind the project to begin construction.

The White House announced today it has signed off on the Keystone XL oil pipeline, authorizing the Canadian company behind the project to begin construction.

The actions drew applause from pipeline supporters, condemnation from opponents.

President Trump touted the potential economic impact of the pipelines.

President Trump used his fifth day in office to move forward the Keystone and Dakota Access pipelines, as well as to streamline regulations for infrastructure and manufacturing.