(Bloomberg) -- House Democrats are investigating the role major oil companies and their trade groups may have played in misleading the public on the role of fossil fuels in causing global warming.

Letters sent Thursday to the heads of Exxon Mobil Corp., BP Plc, Chevron Corp., Royal Dutch Shell Plc, and the American Petroleum Institute and the U.S. Chamber of Commerce seek information on any role they may have played in what the Democrats call a “long-running, industrywide campaign” of climate disinformation, according to the House Committee on Oversight and Reform.

The panel is planning an Oct. 28 hearing on the effort and is seeking the testimony of top executives from those companies. 

“We are deeply concerned that the fossil fuel industry has reaped massive profits for decades while contributing to climate change that is devastating American communities, costing taxpayers billions of dollars, and ravaging the natural world,” said the letters. “We are also concerned that to protect those profits, the industry has reportedly led a coordinated effort to spread disinformation to mislead the public and prevent crucial action to address climate change.” 

The letters were sent by Representative Carolyn B. Maloney, the committee’s chairwoman and Representative Ro Khanna, who leads the subcommittee on the environment.

“API welcomes the opportunity to testify again before the House Oversight Committee and advance our priorities of pricing carbon, regulating methane and reliably producing American energy,” said Bethany Aronhalt, a spokeswoman for the Washington-based trade group. 

An ExxonMobil spokesman said the company had received the letter and would “respond to staff.” Chevron and BP didn’t immediately respond to requests for comment 

Representatives of Shell and the Chamber of Commerce declined to comment. 

Among the documents being sought are communications from company executives on climate science, climate change, clean energy and the role of fossil fuel in causing climate change. The are also seeking documents regarding the influencing of public opinion and communications with the government and the White House.

The committee is also seeking documents and communications related to how much funding the companies have provided to Washington trade groups and how that money was used. In addition, the letters seeks details on any projects the companies have undertaken to protect their facilities from climate change. 

The investigation comes as reports raise questions about the role of the oil industry, and its allies, in preventing action on global warming by sowing doubt about the dangers of fossil fuels, according to the committee. 

Exxon CEO Apologizes for Lobbyist’s Comments in Leaked Video

An Exxon lobbyist was secretly recorded earlier this year by Greenpeace indicating the company had fought early efforts to fight climate change by joining “shadow groups” and that the oil giant only voiced support for a carbon tax because it knew such a policy would be almost impossible to implement. The company’s chief executive officer, Darren Woods, later apologized. 

“As worsening natural disasters linked to global warming devastate communities in the United States and globally, one of Congress’s top legislative priorities is combating the increasingly urgent crisis of a changing climate,” the committee wrote. “To do this, Congress must address pollution caused by the fossil fuel industry and curb troubling business practices that lead to disinformation on these issues.” 

(Updates with statement from America Petroleum Institute in sixth paragraph.)

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