JERUSALEM - Israel has advised its citizens to avoid travel to Turkey following massive protests there against a deadly Israeli military raid on an aid flotilla bound for the blockaded Gaza Strip. The Monday advisory instructs Israelis already in Turkey to keep a low profile and avoid crowded downtown areas. At least 10 people were killed when Israeli commandos halted the flotilla, which was unofficially sponsored by Turkey. Turkey is just an hour flight away and is a popular holiday destination for Israelis. Meanwhile, Israeli commandos on Monday stormed six ships carrying hundreds of pro-Palestinian activists on an aid mission to the blockaded Gaza Strip, killing at least 10 people and wounding dozens after encountering unexpected resistance as the forces boarded the vessels. The operation in international waters off the Gaza coast was a nightmare scenario for Israel that looked certain to further damage its international standing, strain already tense relations with Turkey - the unofficial sponsor of the mission - and draw unwanted attention to Gaza's plight. The tough Israeli response drew condemnations from Turkey, France and the UN's Mideast envoy, while Greece suspended a military exercise with Israel and postponed a visit by Israel's air force chief. About 10,000 Turks also marched from Israel's Consulate in Istanbul towards the city's main square, shouting slogans denouncing Israel. The protesters earlier Monday tried storm the Consulate building but were blocked by police. The Israeli ambassadors in Sweden, Spain, Denmark and Greece were summoned for meetings, and the French foreign minister called for an investigation. Activists from all of those European countries were on board the flotilla. In neighbouring Jordan, hundreds demonstrated in the capital Amman to protest the Israeli action and demand that their government breaks diplomatic relations with the Jewish state. There were conflicting accounts of what happened early Monday. An Al-Jazeera reporter on one of the Turkish ships said the Israelis fired at the vessel before boarding it. The Israelis, who had declared they would not let the ships reach Gaza, allegedly said they only opened fire after being attacked by activists with sticks, knives and live fire from weapons seized from the Israeli commandos.