WASHINGTON — Senior House members said Sunday that there was a mounting consensus among American intelligence officials that a bomb brought down the Russian charter jet that crashed last month in the Sinai Peninsula in Egypt, killing all 224 people aboard.

“I think there’s a growing body of intelligence and evidence that this was a bomb — still not conclusive — but a growing body of evidence,” Representative Adam B. Schiff of California, the top Democrat on the House Intelligence Committee, said on the ABC program “This Week.”

Representative Peter T. King, Republican of New York and the chairman of the Homeland Security subcommittee on terrorism and intelligence, went further, saying on the same program that intelligence officials he had spoken to believed that the Islamic State or an affiliate was behind the crash.

“Right now all the evidence points in that direction,” Mr. King said.

It is not clear how much American intelligence and law enforcement agencies have learned about the crash, which occurred Oct. 31. American investigators have not been invited to visit the crash site, and while the Russian government has asked the F.B.I. for help, it is not known how much information Moscow has shared with the bureau.