The concert's sudden end was announced by Buendia's sister Lally who went onstage after a 20-minute intermission of the planned 30-song concert.
Raimund Marasigan also came out onstage, followed by Marcus Adoro and Buddy Zabala who assisted Buendia's sister in announcing that the concert would no longer continue. The band members apologized to the audience for cutting short their performance. They asked for prayers for the band's lead singer and songwriter.
"He had a slight attack because of stress due to the recent passing of his mother, and their sound check which lasted till 3 a.m. today (Saturday)," said officials from MTV Philippines, who added that Buendia is now in stable condition. MTV Philippines is the concert's organizer.
Here's a video from TV Patrol World, recorded and uploaded to YouTube by yours truly