A 6.4 magnitude earthquake struck the southern Philippines on Tuesday, U.S. geologists said, just a day after a deadly quake rocked the country’s north.

The U.S. Geological Survey said the earthquake hit near Tutubigan, which is hundreds of kilometers south of the quake that hit near Manila. USGS downgraded the magnitude of the latest quake after initially recording it at 6.6.

In the north of the country, Philippine rescuers were scrambling Tuesday to reach dozens of people feared buried under a building near Manila that collapsed a day earlier in a powerful earthquake, as the death toll climbed to 11.

The 6.3 magnitude quake struck northwest of the capital on Monday, scientists from the U.S. Geological Survey said, heavily damaging an airport and sending terrified locals fleeing swaying high-rises.

The worst of the damage was in the province of Pampanga, which was the site of all 11 fatalities, disaster officials said. Dozens of others were injured by falling rubble, including in Manila.

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