Senator Antonio Trillanes IV, Brigadier General Danilo Lim, and 25 other Magdalo Group officers walked out of their trial for the 2003 Oakwood mutiny coup attempt and marched through the streets of Makati.

The mutineers called for the ousting of President Gloria Macapagal Arroyo, and seized the Rizal function room on the second floor of the Manila Peninsula Hotel along Ayala Avenue.

The soldiers, some carrying and wearing Magdalo (mutineers) flags and pins, marched along Makati Avenue and occupied the hotel's second floor.

[citation needed] President Gloria Macapagal-Arroyo called for an emergency Cabinet meeting as she returned to Malacañang Palace aboard a helicopter amid tight security.

Novaliches Catholic Bishop Antonio Tobias, Infanta Bishop Emeritus Julio Labayen, Jimmy Regalario of the Kilusang Makabansang Ekonomiya, Father Robert Reyes, and former University of the Philippines president Francisco Nemenzo joined Trillanes's group, as Executive Secretary Eduardo Ermita and Presidential Spokesperson and Press Secretary Ignacio Bunye rushed back to Malacañang.

[2] The website entry read: The Philippine National Police (PNP) declared a red alert status in Metro Manila as a result of the incident.

"[9] The planned assault was held off until 3:58 p.m. At 3:58 p.m., 50 Special Action Force[10] commandos lined up outside the hotel to enforce the arrest of rebel soldiers.

[12] Footage taken by ABS-CBN Sky Patrol showed Special Action Force commandos moving in battle formation towards the hotel.

[19] By 6 p.m., Trillanes, Lim, and their cohorts, and Guingona were arrested by the PNP and were sent to National Capital Region Police Office (NCRPO) headquarters in Camp Bagong Diwa, Taguig.

ABS-CBN News and Current Affairs, Bloomberg, NHK, DWIZ, Manila Bulletin and Malaya journalists who were covering the event were also arrested.

[25] The PNP ordered a manhunt for the soldiers who escaped from the hotel, including Marine Captain Nicanor Faeldon; meanwhile, several persons of interest were detained at Camp Bagong Diwa.

The next day, Armed Forces chief-of-staff Hermogenes Esperon announced the arrest of communist New People’s Army operative Myrna Hombrebueno claiming that she and her group were connected with the Magdalos.

Had Trillanes succeeded, according to Esperon, a National Transition Council (NTC), allegedly would replace the Arroyo administration, and the country put under a "lean and mean" military and police force (per 5-page document – "Proposed Program").

[38] Chief Justice Reynato Puno said that he was not interested in a proposal to head a caretaker government if President Arroyo was removed from power.

[41][42] The United States announced its continued support for Arroyo's government and said it was disturbed at extraconstitutional attempts at regime change in the Philippines.