HARTFORD, Conn. -- On Tuesday, Gov. Jodi Rell announced that Wednesday will be a statewide day of mourning for the victims of the Kleen Energy plant explosion.

Rell ordered Connecticut state flags to be flown at half-staff from sunup to sundown and asked residents to observe a moment of silence at 11 a.m., the approximate time of the explosion that devastated the power plant.

Rell said, "Connecticut's people always come together in the face of a tragedy," Rell said. "On Wednesday let us remember the lives that were lost in this disaster and the grief of the families the workers left behind. May our thoughts and prayers offer some measure of consolation in a time of loss and infinite heartache."

Five people were killed in the blast on Sunday and about a dozen others were injured.

Those killed have been identified as Chris Walters, 48, of Florissant, Mo.; Ronald Crabb, 42, of Colchester; Raymond Dobratz, 58, of Old Saybrook; Roy Ruston, 36, of Hamilton, Ontario; and Peter Chepulis, of Thomaston. Read more about the victims here.

Officials said Monday that everyone who was inside the plant at the time of the explosion has been accounted for. They said about 100 people were inside at the time of the blast.

Rescue crews combed through the debris throughout the day Sunday and into the early-morning hours Monday. They said that while much of the debris has been sifted through, there is still a portion of the collapsed plant that is too dangerous to dig through. They said piles of rubble are 10 feet tall in some parts of the plant, and mounds of rubble and debris are everywhere.

The explosion occurred during a test as crews purged a natural gas line inside the plant. Workers told Eyewitness News that the pipes rumbled and that the rumblings got louder before the blast. The back wall of one of the plant's buildings collapsed, its steel walls blown off. The company was working to get the plant running by this summer. When completed, the 620-megawatt plant would be the largest of its kind New England.

The investigation into what caused the explosion is ongoing, with state and federal officials working to determine the source of the blast.