MANILA (Updated) -- The Iglesia ni Cristo's evangelical medical mission started congesting early morning traffic in parts of Manila Monday.
Radio reports said that before 7 a.m., the Quezon Bridge underpass in Quiapo was no longer passable, while parts of España Boulevard were occupied by the group's buses.
In Pasay City, buses bearing members of the religious group arrived from Las Piñas City, Cavite and Batangas.
Television reports said that the religious group will hold an "evangelical mission" by 9 a.m. and resume its free medical and dental services an hour after that until 7 p.m.
Meanwhile, police arrived in Manila early Monday to secure the venue of a medical mission to be conducted by the Iglesia ni Cristo.
Radio reports said the National Capital Region Police Office arrived before 5 a.m. to ensure Monday's mission is peaceful and orderly.
NCRPO head Chief Superintendent Marcelo Garbo Jr. assured there will be "enough" police personnel to secure the event.
Classes in Metro Manila up to the high school level were suspended in anticipation of heavy traffic. College classes were suspended in Manila, Marikina and Malabon.
Meanwhile, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) said there may be isolated rain in the afternoon or evening.
The Metropolitan Manila Development Authority had expected heavy traffic in major thoroughfares, and advised alternate routes.