BAGHDAD (AFP) - Iraq on Tuesday slammed a deadly American helicopter raid on a Syrian border village at the weekend, an assault a US official in Washington said had targeted a prominent militant. The unidentified US official said the weekend raid on the Syria-Iraq border had been "successful," and that among those believed killed was Abu Ghadiya, "one of the most prominent foreign fighter facilitators in the region." But Syria said the eight people killed in Sunday's assault were all civilians, including children, and it has branded the raid " the first confirmed US action of its kind inside Syrian territory " a "terrorist" act. "The Iraqi government rejects the US helicopter strike on Syrian territory, considering that Iraq's constitution does not allow its land to be a base for launching attacks on neighbouring countries," Iraqi government spokesman Ali al-Dabbagh said in a statement. "We call upon American forces not to repeat such activities and Baghdad has launched an investigation into the strike." Iraq's parliament said in a statement it has asked the cabinet to "keep it and the Syrian brothers informed about the investigation launched by the government into the raid. It regrets that the operation took place at a time when relations between Iraq and its neighbour hours are progressing." On Monday Syrian Foreign Minister Walid Muallem, speaking in London after talks with British Foreign Secretary David Miliband, said: "Killing civilians in international law means a terrorist aggression." EU foreign policy chief Javier Solana, who was in Syria earlier this month, voiced concern about the US operation. "I am concerned at the air raid that took place inside Syria... which resulted with the death of civilians. "I have just returned from Syria where I discussed prospects for improved stability and security in the region with the authorities," he said. "I hope the situation can rapidly return to normality." In Cairo a foreign ministry statement carried by Egypt's official MENA news agency called the US strike a "serious violation of Syria's sovereignty." China also condemned the raid, with foreign ministry spokeswoman Jiang Yu telling reporters that Beijing opposes "any deed that harms other countries' sovereignty and territorial integrity." Meanwhile, Syria on Tuesday protested to the UN Security Council over a deadly US helicopter raid on a village near the Iraqi border, in a letter to Secretary General Ban Ki-moon, the state news agency SANA said. "Syria draws attention to this aggressive act and expects the UN Security Council and member countries to assume their responsibility by preventing a repetition of this dangerous violation," the letter read. It called for the Security Council "to hold the aggressor responsible for the deaths of the innocent Syrian nationals." While, Syria decided on Tuesday to close the US cultural centre and the American school in Damascus after a deadly US raid on a village near the Iraqi border, the state news agency SANA reported. Damascus has said the eight people killed in Sunday's assault were all civilians, including children, and it has branded the raid " the first confirmed US action of its kind inside Syrian territory " a "terrorist" act. The Syrian cabinet in a meeting chaired by Prime Minister Mohammed Naji Otri called for the education and culture ministers to take the necessary measures to close the two American institutions, SANA said. In the aftermath of the helicopter-borne raid by US troops launched from Iraqi territory, the ministers also decided to postpone a November 12-13 meeting of the Syrian-Iraqi high commission. The ministers condemned the raid, which a US official said targeted foreign fighters who infiltrate Iraq, as a "barbarous crime, which amounts to the peak of state terrorism as practised by the US administration." It was a "violation of the UN Charter and international law," they charged in a statement. Meanwhile, the number two in Syria's ruling Baath party, Mohammed Saeed Bkheitan, said the US raid amounted to "an act of piracy and state terrorism" against a farm inhabited by families and labourers.