LONDON/HONG KONG (AFP) - European stock markets shot up on Thursday, with London closing up 4.28 percent amid greater optimism following a summit of G20 world leaders in London and positive economic data from the United States. Londons FTSE 100 index of leading shares jumped to 4,124.97 points, while the CAC 40 index in Paris soared 5.37 percent to 2,992.06 points and the DAX in Frankfurt rocketed up 6.07 percent to 4,381.92 points. Meanwhile, Asian stocks rocketed Thursday as investors hoped for a positive outcome from the G20 summit and data out of the United States showed improving economic activity. Hong Kong led the surge, piling on 7.41 percent, while Tokyo jumped 4.40 percent to a three-month high, Sydney added 2.81 percent and Singapore almost six percent, continuing an upward trend that has lasted four weeks. Many indexes closed at highs not seen for several months. Leaders of the worlds 20 developed and developing nations sat down to meet Thursday in London to hammer out a plan aimed at pulling the world out of its worst slump in more than 70 years. Asian investors were also following a two percent rise on Wall Street that was brought about by the release of a survey that showed a slightly improved manufacturing outlook. The US Institute of Supply Management manufacturing index for March, also known as the purchasing managers index, came in at 36.3pc, above the expected reading of 36.0 and up from the February reading of 35.8. The figure is far below the 50 percent level that separates expansion and contraction, however. Other data showed US auto makers had sold 24.5 percent more cars in March than in February.