Disaster agency spokesman Sutopo Purwo Nugroho said the waves reached as high as 6 metres (20 feet) in at least one area, according to a report relayed by a man who called to say he survived only by climbing and clinging to a tree.
Buhari told the Indonesian government that "my administration and the entire people of Nigeria are with you at this difficult and tough moment when you struggle hard to minimise the impact of this tragedy and in your efforts to provide temporary relief and comfort to the affected victims".
The first wave of rescuers and emergency aid arrived yesterday in Palu, Central Sulawesi, as the Indonesian province begins to count its losses after it was hit by a 7.4-magnitude quake a day earlier.
"We are having difficulty deploying heavy equipment to find victims under the rubble of buildings because numerous roads leading to Palu city are damaged".
The festival was in Palu, the capital of Central Sulawesi province, which was strewn with debris from collapsed buildings and pooled seawater Saturday.
CNNreports that rescue workers are still searching for survivors after the quake hit the Indonesian island of Sulawesi and triggered a subsequent tsunami.
The agency on Saturday was widely criticized for not informing that a tsunami had hit Palu, though officials said waves had come within the time the warning was issued.
A remote fishing village is feared to have been wiped out after a 7.5 magnitude natural disaster rocked Indonesia, killing at least 384.
After a local hospital was damaged, medical staff opted to treat dozens of wounded residents just outside the building, Sutopo said.
Injured people are treated outside at Army hospital following earthquakes and a tsunami in Palu, Central Sulawesi.
In this photo released by the Disaster Management Agency, a house sits damaged after a magnitude 6.1 quake early Friday, Sept. 28, 2018, in Donggala, central Sulawesi, Indonesia.
Almost 400 people have been confirmed dead after a tsunami triggered by a huge natural disaster hit Palu, in Indonesia.
JAKARTA-The death toll from the quake and tsunami on the Indonesian island of Sulawesi jumped to 384 on September 29, authorities said, with many of those killed swept away by giant waves as they played on the beach.
Waves up to 3m (10ft) high swept through Palu on Sulawesi island.
"Many houses have collapsed", said an official with the local disaster agency, Akris.
Numerous earthquakes have struck the region in recent months. Even aid deliveries by sea have been a challenge since Palu's port was badly damaged by the tsunami.
The death toll from the massive quake, which sent tsunami waves crashing into the island of Sulawesi, now stands at more than 420, but authorities expect that number to rise sharply as reports come in from remote areas that have been cut off from communication.
"We hope there will be global satellites crossing over Indonesia that can capture images and provide them to us so we can use the images to prepare humanitarian aid", Nugroho said.
An air traffic controller at Palu airport died ensuring a plane took off safely after Friday's quake.
President Joko Widodo is scheduled to visit evacuation centres in Palu on Sunday.
"We're now getting limited communications about the destruction in Palu city, but we have heard nothing from Donggala and this is extremely worrying", he said.
United Nations spokesman Stephane Dujarric said United Nations officials were in contact with Indonesian authorities and "stand ready to provide support as required".