CAIRO (Reuters) - Egypt's main stock index plunged 6 percent on Sunday in the first trading session since President Mohamed Mursi ignited a political crisis by expanding his powers.

Stocks crashed just after the 3.30 a.m. EST opening. The stock exchange suspended trading until 4.01 a.m. EST, the stock exchange said.

"We are back to square one, politically, socially, unrest, clashes and so on," said Mohamed Radwan of Pharos Securities.