Breaking news: 太平洋沿岸地区发生大地震

(CNN) -- Residents in coastal cities in Chile started to evacuate Wednesday after some authorities warned of a possible tsunami after a strong aftershock.

Some officials in the fishing village of Dichato and in the city Concepcion told residents they had one hour to leave low-lying areas. Those warning were rescinded minutes later when the National Emergency Office said there was no warning.

There is no tsunami alert, an angry-sounding military official yelled repeatedly on CNN Chile, CNN\'s partner network in the nation.

The Pacific Tsunami Warning Center also said it had not issued any warning, watch or advisory as result of the aftershock, which had a preliminary magnitude of 5.6, according to the U.S. Geological Survey.

We\'re not seeing anything on our sea levels gauges, said Charles McCreery, director of Pacific Tsunami Warning Center.

Authorities said they did not know how the false alarm got started.

Aid and increased security have started flowing into hard-hit areas of Chile, but some desperate residents complained Wednesday that they still haven\'t received any food or water since Saturday\'s massive earthquake.

President Michelle Bachelet again urged all residents Wednesday to remain calm despite the shortages and lawlessness in Concepcion, Talcahuano and other areas of central and southern Chile. For the second day, she also warned that looting will not be tolerated.

Nobody can argue that taking a refrigerator is an act of survival, Bachelet said at a morning news conference. That is simply vandalism and delinquency.

An overnight curfew remained in effect for the third day in Concepcion, the scene of the worst looting. Authorities said they would take whatever steps are necessary, and 35 people have been arrested for curfew violations.

The death toll increased to 802, with nearly 600 of those fatalities occurring in the Maule region, the National Emergency Office said Wednesday.

In Concepcion, 30 trucks with food and water arrived late Tuesday. The supplies were being distributed Wednesday.

Concepcion Mayor Jacqueline Van Rysselberghe said it was a good start but not nearly enough.

The aid would be distributed in areas where there has been little or no looting, she said in an interview with CNN Chile.

Concepcion is less than 10 miles inland of Talcahuano, but that short geographical distance made a huge difference in the damage the two towns received.

In Concepcion, the damage was caused by the earthquake. The fatalities and injuries there were the result of buildings that collapsed.