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MANILA - Two military trucks were spotted early Thursday near the Senate building, where Senator Antonio Trillanes has been holed up for 2 days following the withdrawal of the amnesty that absolves him of charges over leading 2 failed mutinies.

Senate President Tito Sotto earlier said Trillanes could not be apprehended in the Senate premises while it is in session and banned policemen and soldiers from the legislative halls.

Around 6 a.m. Thursday, a military truck carrying soldiers briefly stopped outside the Senate's main gate but left immediately.

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ABS-CBN's news team followed the vehicle until it stopped in front of the Government Service Insurance System (GSIS) building, where another military truck was parked just meters away from the Senate office.

Both trucks, carrying around 20 soldiers in total, were still in the area around 7:30 a.m.

2 military trucks, pumuwesto sa kanto ng GSIS gate at Diokno Blvd sa Pasay City. | via @RPfredcipres pic.twitter.com/dObOd6NDeu — DZMM TeleRadyo (@DZMMTeleRadyo) September 5, 2018

Trillanes was among the leaders of the Magdalo band of junior officers and soldiers who took over the Oakwood luxury apartments in Makati on July 27, 2003 to protest alleged corruption under then President Gloria Macapagal-Arroyo

In 2007, the group walked out of their coup d'etat hearing and took over the Manila Peninsula hotel, also in Makati, in another protest against Arroyo.

Trillanes and his comrades were granted amnesty in 2011 by then President Noynoy Aquino.

President Rodrigo Duterte, in a proclamation made public on Monday, voided Trillanes' amnesty for allegedly failing to apply for it properly and express guilt for his crimes.

A Makati court said a motion for the issuance of an arrest warrant against Trillanes will have to wait for the lawmaker's comment and a hearing next week.

The Department of National Defense, however, said Trillanes can be arrested even without a warrant because the withdrawal of his amnesty revives his military status, which allows him to be tried before a court martial.

TENSION IN SENATE HALLS

Trillanes said he will stay at the Senate premises and will seek from the Supreme Court on Thursday a halt order against the voiding of his amnesty.

Four of Trillanes' supporters were kicked out of the Senate late Wednesday for carrying placards with the statement "#DU30DUWAG."

Ilang supporters ni Sen. Trillanes na nagpalipas ng gabi sa labas ng kaniyang opisina, pinaalis sa labas ng opisina ng Senador. Ito'y dahil sa kanilang mga dalang plakard na may mensahe laban sa Pangulong Duterte. | via @isay_reyes pic.twitter.com/89aP4UadgE #TrillanesAmnesty — ABS-CBN News (@ABSCBNNews) September 5, 2018

The Senate is not the proper venue for such protests, security officers said.

Trillanes last talked with reporters outside his office around 8 p.m. Thursday.

With reports from Isay Reyes and Fred Cipres, ABS-CBN News