Strong wind swept Beijing on Tuesday, which blew away part of the No.3 Terminal (T3) Building's roof at the Beijing Capital International Airport (BCIA), the Beijing Times reported on Wednesday.

A passenger surnamed Li said he saw foam-like debris being blown away from District D's roof at the T3 Building, which then scattered on the runway as maintenance staff rushed to repair the facility.

As for the broken roof, the microblogs of some passengers questioned the fact that given the BCIA is a landmark building in Beijing, how can it be damaged by the wind? They indicated that there may be some kind of shoddy work or inferior materials used in its construction.

Sources from News Center at BCIA said the maximum speed of last night's wind reached 24m/s or grade 9. As for questions like what kind of material the foam was and whether the incident has affected any flights, they didn't answer.

An insider who was involved in the construction of the buildings, indicated that the incident wasn't due to quality problems and the buildings were constructed with the capability of resisting winds with a maximum speed of up to 28.3 m/s, or 12 grade, which surpasses the national construction standard.

As reported, the roof of T3 building was torn up last December and more than 200 flights were delayed at that time.