LONDON - Oil prices rose on Tuesday amid tensions over major crude producer Iran, which insisted that US military deployment in the Gulf is "a source of insecurity," dealers said. Brent North Sea crude for delivery in September climbed 62 cents to $103.99 a barrel in London midday deals. New York's main contract, light sweet crude for August gained 11 cents to $88.54. Iran on Tuesday said that US military deployment in the Gulf was "a source of insecurity," after the fatal shooting of an Indian fisherman by a US navy ship in waters off Dubai.