LONDON  - Oil prices hit record high points close to 144 dollars per barrel on Monday as the dollar fell further and amid a conference and protests staged in response to soaring crude, analysts said. Brent North Sea crude reached a historic peak of 143.91 dollars a barrel and New York light sweet crude struck an all-time high of 143.67 dollars. "The market remains well supported by the broad weakness in the dollar, ever increasing investor interest in commodities, persistent supply disruptions and geopolitical tensions," Sucden analyst Andrey Kryuchenkov said on Monday. Crude futures have doubled in the past year and have risen by almost 50 percent since the start of 2008, when they breached 100 dollars for the first time, triggering fears over inflation and slower economic growth. Consumer countries blame record prices on tight supplies amid strong demand and unrest in producer countries such as Iran, Iraq and Nigeria. In particular, they accuse OPEC of not producing enough crude. The Organization of Petroleum Exporting Countries insists that the weak dollar is at fault. The dollar fell further against the euro on Monday, fuelling demand for oil, which is priced in the US unit, from traders holding stronger currencies, traders said. After striking a fresh pinnacle, Brent North Sea oil for August delivery stood at 143.11 dollars a barrel, a rise of $2.80 from Friday's close. New York's main oil contract, light sweet crude for August delivery, was at $142.65, a rise of $2.44. On Monday, high fuel prices sparked protests among hundreds of truckers across France, blocking main highways and snarling commuter traffic around Paris. Meanwhile leading figures in the oil world gathered in Madrid for one of the industry's biggest events, with the search for a remedy to record crude prices again stymied by division about the causes. A week after failing to deflate the price of crude at a summit in Saudi Arabia, the world's biggest oil producers and consumers will get another chance during talks here to explore ways of calming tense global energy markets. Pressure is mounting for a response to ease the pain of consumers suffering from high fuel costs and a general increase in the cost of living as crude prices soar. One of the main points of contention is the role of speculators, blamed consistently by producer countries for the doubling of crude prices over the last 12 months. Western oil chiefs, backing the view of governments in consumer countries, insisted on Monday that speculators were the wrong target and that the failure of supply to match rising demand was the real cause. Prices have also forged higher in recent weeks and months because of ongoing violence in Nigeria " which is one of Africa's crude oil producers. Production at Shell's main offshore oilfield in Nigeria has still not returned to full capacity after an attack by militants earlier this month, the Anglo-Dutch oil giant said on Monday. Militants belonging to the Movement for the Emancipation of the Niger Delta attacked the Bonga platform located 120 kilometres (75 miles) offshore on June 19, forcing Shell to shut down production there and raising fears for the security of deep sea facilities in the region.