The 6.5 magnitude quake hit the island of Mindanao, the US Geological Survey said, in the same area where a strong tremor killed at least six people on Tuesday.
An earthquake of magnitude 6.6 sent people scrambling as it shook buildings and disrupted power supply in the central area of the Philippines' southern island of Mindanao, killing at least two and injuring dozens, authorities said.
The attacks takes place just days after a deadly bombing at a Catholic cathedral and a vote backing self-rule in the Muslim-majority region.
Authorities recovere another unexploded bomb nearby as government forces imposed a security lockdown in Cotabato city.
Moro Islamic Liberation Front gathers tens of thousands of supporters to campaign for a new autonomy law which President Rodrigo Duterte signed last week, allowing self-rule for Muslims in 2022 in the restive south of the country.
Mount Mayon continues to eject more lava and ash, while displacing 61,000 Filipinos since January 13, according to a fresh count by the country's disaster agency.
A tropical storm in the Philippines his the southern part of the island, killing 240 people, while landslides and mudslides bury many in remote areas.
Disaster officials said 159 people were listed as missing while about 70,000 had been forced from their homes after tropical storm Tembin hit the southern island of Mindanao.
Officials said the tropical storm in the south of the country unleashed flash floods that swept away people and houses and set off landslides, leaving at least 153 people missing.
Many fear that moves by President Duterte to reign in Muslim extremists might be more than simply dealing with extremists. Some are extremely concerned.
The Senate and House of Representatives easily voted to approve President Rodrigo Duterte's request to extend martial law until the end of 2018 in the restive southern region.
Philippine President Rodrigo Duterte vowed on Monday to correct “historical injustice” in a speech to Filipino Muslim rebels. He was speaking at a massive rally organised by the Moro Islamic Liberation Front.
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