Evidence indicates the Islamic State was behind the crash of a Russian plane over Egypt last week, said two members of the House Intelligence Committee appearing Sunday on ABC's "This Week" with George Stephanopoulos.

Though the evidence is not conclusive, Rep. Peter King, R-N.Y., said he is "almost ready to conclude that it was ISIS, that it was either ISIS or an ISIS affiliate. And to me, I think that is the general consensus among people I've spoken to in the intelligence community."

Rep. Adam Schiff, D-Calif, who is the ranking member of the intelligence committee, said he too suspects it was the Islamic State behind the crash and that he thinks the terrorist organization may be shifting its strategy to attack planes.

"I also think that ISIS may have concluded that the best way to defeat airport defenses is not to go through them but to go around them with the help of somebody on the inside," said Schiff. He added that at least a dozen airports in the region are vulnerable.

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