LA UNION--Seventeen students in La Union province have been allegedly possessed by an "evil spirit" since Monday.

They repeatedly scream and appear to be delirious.

Visions of a lady in black and a bloody girl are allegedly causing the supposed "mass possession".

One Grade 9 student repeatedly said: “'Yung kapatid ko! Namatay! 'Yung kapatid ko! Maibabalik niyo ba yung buhay ng kapatid ko? Hindi! Hindi niyo maibabalik! Tinatawag namin kayo lagi, hindi kayo pumupunta!"

The student said she remembered seeing the bloody vision coming to her before she passed out. It took two hours before she calmed down.

"Nung nakaupo ako, may nakita akong bata. 'Yung buhok niya, mahaba na kulay itim tapos dugo-dugo mukhang na-trap sa isang gumuhong building,” she said.

Another student said: “’Yung kapatid daw po niya namatay dahil sa amin. Nadaganan po ata ng hollow blocks no'ng ipinatayo yung building."

Per local tradition, teachers covered the faces of the affected students with black cloth to drive out the alleged "evil spirit".

A mass blessing of the classrooms will take place on Friday.