Stock markets in several Gulf countries, where many leading firms have interests in Egypt, plummeted today on mounting concerns over developments in the world's most populous Arab nation. The Dubai Financial Market shed over six percent of its value at the opening of trading week, with the DFM index dropping to 1,505 points. Neighbouring Abu Dhabi Securities Exchange was down 3.74 percent. Kuwait Stock Exchange, the second-largest Arab stock market after Saudi Arabia's, also dropped. Qatar Exchange opened over five percent down. It slightly improved later in the day, but was still 4.15 percent down.