BAGHDAD (AP) — Three overnight airstrikes on eastern Syria near a strategic border crossing with Iraq killed six Iran-backed militants Saturday, two members of Iraqi militia groups told The Associated Press.

The strikes on the border region of Boukamal came hours after an umbrella group of Iran-backed Iraqi militants known as the Islamic Resistance claimed an attack on a U.S. military base in northern Iraq's city of Irbil.

The group has conducted over a hundred attacks on U.S. positions in Iraq and eastern Syria since the onset of the Israel-Hamas war on Oct. 7.

Four of the militants killed were from Lebanon's powerful Hezbollah group, while the other two were Syrian, the militia group members said. Another two were injured, they added. They spoke on condition of anonymity because they were not cleared to speak with journalists.

Meanwhile, an activist collective that covers news in the area, Deir Ezzor 24, said the airstrikes hit two militant posts and a weapons warehouse that it says was recently stocked with rocket launchers and munitions.

Britain-backed opposition war monitor the Syrian Observatory for Human Rights said that in addition to the weapons warehouse, the strikes targeted a militants' convoy that had arrived in Syria from Iraq and a location where a militia affiliated with Iran’s paramilitary Revolutionary Guard was training.

The monitoring group reported that the strikes killed nine people — three Syrians and six people from other nationalities.

A U.S. official said the United States did not carry out the strikes. The official spoke on condition of anonymity to discuss military operations.

Washington has confirmed previous strikes on Iran-backed militia positions following the surge of attacks over the past two months.

President Joe Biden last week ordered the U.S. military to carry out strikes on Iranian-backed Iraqi groups following a rocket attack that wounded three U.S. troops.

The spike in tension has put Baghdad in a delicate situation. Iraqi Prime Minister Mohammed Shia al-Sudani has tried to ease the strain between the militant groups that helped him reach power and the U.S. where Iraq's foreign reserves are housed.

The Boukamal region in Deir el-Zour, Syria, located along the Iraqi border, has been a strategic area for Iran-backed militants since it was taken back from the extremist Islamic State group in 2019. U.S. coalition forces conducted strikes targeting convoys there before the recent spike in tensions.

Later, Syrian state media reported that Israeli airstrikes over areas south of the city of Aleppo caused damage, but no casualties were reported. Pro-government radio station Sham FM said the strikes were near Aleppo's airport but did not damage it.

The Syrian Observatory for Human Rights said just one of six Israeli missiles landed near the airport and that the rest landed in areas where Iran-backed militants and weapons warehouses were present. It said the strikes killed or wounded seven people, without giving further details.

Israel has carried out hundreds of strikes on targets inside government-controlled parts of war-torn Syria in recent years.

It does not usually acknowledge such airstrikes. When it has, however, it said it was targeting Iran-backed groups there that supported Syrian President Bashar Assad’s government.

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Chehayeb reported from Beirut. Associated Press writer Lolita Baldor contributed to this report from Stratford, Connecticut.