Central Chile region Biobio suffered an aftershock measuring 6.6 magnitude on the Richter scale at 8.47 a.m. local time on Friday, the strongest since the nation's deadly Saturday quake.

The Chilean Navy's tsunami alert website said that there was no risk expected from the quake, which took place offshore at around 30 kilometers northwest of Concepcion, Chile's second largest city, where the army has been enforcing a curfew due to chaos triggered by Saturday's quake, which measured 8.8 magnitude on the Richter scale.

According to the U.S. Geological Service (USGS), Chile has suffered seven aftershocks measuring more then five magnitude in the last 12 hours. Chilean media reported two that were strong enough to feel before 10 a.m. local time.

The news comes a day after Chile official revised down to 279 the death toll for Saturday's quake, where media have reported that the tsunami that followed the quake killed more than the tremor itself. Earlier estimates used by government officials were for around 800 deaths, which might rise to 1,000 as more bodies are found. The 279 are people whose bodies have been identified by relatives or from state records.

In its statement revising the number, the ministry published the names and locations of the dead. According to the new data, Constitucion, a port town in Maule region, central Chile, was worst hit with 80 confirmed deaths. The epicenter of Saturday's quake was 95 km off Maule's shore.