Ecuador's security minister says the death toll from the country's devastating earthquake has risen to 350.

Cesar Navas tells the Teleamazonas station that rescuers are continuing to seek more victims and survivors in collapsed buildings after Saturday night's magnitude-7.8 quake.

The Spanish Red Cross says as many as 100,000 people may need assistance in the area of Ecuadordevastated by a magnitude-7.8 earthquake that killed at least 272 people and injured thousands.

The group says in a statement that there is no official estimate yet on the number of affected people but it estimates that between 70,000 and 100,000 will need some kind of help. It says that 3,000 to 5,000 people need temporary housing after the quake flattened homes.

Spain's Red Cross says it is helping the Ecuadorean Red Cross evaluate need for the coastal area devastated by the quake.

The statement says about 800 volunteers and staff members with the Ecuadorean Red Cross are involved with search and rescue operations and helping provide first aid and other services to people in the quake zone.

As aid poured into Ecuador, the country's security coordination office issued a tweet thanking Mexico for sending 120 rescue workers.

New aftershocks are rattling Ecuador - part of the hundreds following a deadly magnitude-7.8 earthquake that has killed at least 272 people in the Andean nation.

Ecuador's Geophysics Institute says 230 aftershocks had hit as of Sunday night, ranging in magnitude from 3.5 to 6.1 and striking at shallow depths.

The institute also sent out a steady stream of tweets Monday morning each time a new aftershock was registered. Most were happening in the Pacific Ocean near the hard-hit coastal cities of Pedernales and Manta.

Ecuador's president, Rafael Correa, has warned the death toll could rise significantly from Saturday's quake, which also injured more than 2,500 people.