A massive fire tore through Manila’s historic post office building overnight, slightly injuring seven people and razing the nearly 100-year-old landmark in the Philippine capital, police and postal officials said Monday.

The fire started before midnight in the basement of the neoclassical, five-story building and was brought under control Monday morning more than seven hours after it began, firefighters said.

An investigation was underway to determine the cause of the fire and what was damaged, officials said, adding seven people, mostly firefighters, sustained minor injuries or were overwhelmed by thick smoke.

6 DEAD, 7 INJURED IN ABU DHABI HOUSE FIRE

Manila, Philippines, post office

Smoke billows from the still smoldering Manila Central Post Office after a fire hit early Monday in Manila, Philippines.  (AP Photo/Aaron Favila)

The Manila Central Post Office was one of the capital’s busiest office buildings but was closed when the fire started. The building was the country’s main mail-sorting and distribution hub and was the central office for the Philippine Postal Corporation.

The building, recognized as a national landmark, was built in 1926 with high columns in the traditional neoclassical style. It was severely damaged during World War II and was rebuilt in 1946.

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It has been used as a backdrop for many Philippine movies and stands near a plaza named after national hero Andres Bonifacio which has been the site of protests by left-wing and nationalist activists over a range of political and social issues.

It is located along the Pasig River on a main intersection of the capital’s key roads.

Postal service in the Philippines began during the Spanish colonial period with horse-riding mail couriers.