MANILA, May 3 -- Five foreign nationals were arrested in separate operations in Pangasinan and Ifugao as the Bureau of Immigration's (BI) intensified crackdown on overstaying and undocumented aliens.

The foreigners were brought to the BI main office in Manila for booking and legal processing, according to a news release over the weekend.

They are now detained at the BI Warden Facility in Taguig pending deportation.

In Dagupan City, Nigerian national Emmanuel Emeka Ndukwe, 34, was apprehended on April 25 near a church in Barangay Bolosan.

He was undocumented and holding an expired passport. During booking, Ndukwe turned violent, head-butting two BI staff, including a nurse.

On April 28, four Chinese nationals were arrested in Lagawe....