Iran or its affiliates could target U.S. defense industrial base companies via cyberattacks, according to a joint warning from multiple government agencies.

The group of agencies, which includes the Cybersecurity and Infrastructure Security Agency, the FBI, the Defense Department Cyber Crime Center, and the National Security Agency, said Monday that it has not “seen indications of a coordinated campaign of malicious cyber activity in the U.S. that can be attributed to Iran.”

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U.S. defense contractors, “particularly those possessing holdings or relationships with Israeli research and defense firms, are at increased risk,” the agencies said.

Israel and Iran have conducted cyber operations against each other for years, though the two had never engaged in a direct and sustained military confrontation until this month.

Iran was supposedly responsible for cyberattacks in 2023 against Israeli organizations in the education and technology sectors. A pro-Israel group allegedly stole around $90 million from Iran’s largest cryptocurrency exchange.

Israel launched an attack targeting Iran’s nuclear infrastructure, senior military leaders, and scientists on June 13, while Iran was able to fire several retaliatory barrages of ballistic missile attacks on Israel. The United States got involved more than a week ago, with U.S. troops targeting three of Iran’s facilities, two of which had underground components.

U.S. political leaders have declared that Iran’s nuclear facilities were completely destroyed, though their certainty has been called into question with an early Defense Intelligence Agency analysis of the attack. The Trump administration maintains that the Iranian nuclear program was set back years in the aftermath of the attack.

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Following the U.S. strikes, Iran carried out a meek retaliatory attack on the U.S.’s Al Udeid Air Base in Qatar, which it did to save face. Iranian leaders told their American counterparts when and where the attack would occur, President Donald Trump said, to avoid incidentally causing U.S. casualties, which would then likely incur a heavy U.S. military response.

Israel and Iran then agreed to a ceasefire, which included a tense beginning on Tuesday, though it has held through for almost a week. Iran and the U.S. are expected to hold talks in the near future to discuss the long term, Trump announced last week.