At least four people were killed after a 6.6-magnitude earthquake struck in the southern Philippines on Tuesday, just over a week ago because strong tremor jolted the same area and left seven people dead.
The quake's epicenter was located in northeast of Tulunan town in Cotabato province, 972km (604 miles) south of Manila, the Philippine Institute of Volcanology and Seismology said.
Seismology experts said there were no tsunami threats.
A 15-year-old high- school student from Davao del Sur province was confirmed dead after being hit by blocks during the quake, the public information office of Magsaysay town in the province was quoted by news reports as saying.
CNN Philippines is also reporting that a 66 -year-old man died in Koronadal City, South Cotabato after sustaining head injuries during the incident.
A father and his child were also killed in the town of Arakan, Cotabato, according to ABS-CBN News.
A Manila-b ased radio station also reported that several children in Tulunan were injured when their school collapsed.
The quake was initially reported as magnitude 6.8 but was later downgraded to 6.6.
The quake was struck at 9:04 am (01
Photos posted on social media also showed a collapsed school building in Tulunan and several injured students.
In an interview with Manila-based radio station DZMM, Renato Solidum, head of the country's earthquake monitoring agency, warned of more aftershocks.
Tulunan Mayor Reuel Limbungan said he had ordered classes and
"All patients in hospitals should also be moved outdoors for now," he told Manila radio station DZMM. "This was a stronger earthquake from last time."
Dibu Tuan, mayor of the neighboring town of T'boli, South Cotabato described the earthquake on Tuesday as "stronger" than the tremor that hit earlier this month.
On October 16, a 6.3-magnitude quake struck almost the same area, with the epicenter located southwest of Makilala town in the nearby North Cotabato province.
Seven people were killed in that quake, which also left 215 people injured, disaster relief officials said.
The Philippines is located on the Pacific Ring of Fire, where about 90 per cent of the world's earthquakes strike.
PANOORIN: Mga empleyado ng mall on our ika-5 palapag with GenSan, nagsigawan at nag-iyakan kasunod ng naramdamang intensity 5 on lindol | via @JayDayupay / Kuha ni Jaime Rogelio Espina #MindanaoQuake pic.twitter.com/QhYx2CBgqf
In July 1990, more than 2,400 people were killed in the northern island of Luzon in a magnitude-7.8 quake, one of the strongest ever to hit the country.
Al Jazeera and news agencies