HAPPENING NOW: 103rd Infantry Brigade now being fired upon from at least 2 sides. Soldiers ran for cover pic.twitter.com/dBfCYgjYkD

— Chiara Zambrano (@chiarazambrano) May 25, 2017

Gunfire erupted at a military camp in Marawi City early Thursday evening as government pursued remaining members of the terrorist Maute group, which has mounted a series of attacks across town since Tuesday.

In an interview with DZMM, ABS-CBN News' Chiara Zambrano said gunshots were heard at dusk inside Campo Ranaw, the Philippine Army's 103rd Infantry Brigade camp, sending soldiers scampering for cover.

"Syempre ang assumption mo kapag nandito ka ay ligtas ka na. Biglang may narinig kaming mga putok. Nung una ay walang pumapansin dahil maghapon, magdamag namang may nagpapaputok," Zambrano said.

"Pero nung narinig ko na may parang sumisipol, ibig sabihin 'nun usually ay naririnig mo yung... ito may pumuputok na naman, mayroong bala papunta sa direksyon mo at naririnig mo yung sipol dahil naririnig mo 'yung balang gumagalaw," she reported.

Zambrano said gunfire came from two directions.

"So ang inisip ko ay papunta dito sa direksyon 'yung bala. Paglabas ko, pagsilip ko, aba’y nagsisitakbuhan na rin yung mga tropa. Ang iba, nagtago sa puno, sa likod ng tangke," she said.

She said there was continuing and escalating gunfire as of past 6 p.m.

Six more soldiers died in fresh clashes earlier Thursday, bringing the death toll on the government side to 13, following the death of five soldiers and two police officers earlier in the week.

The military earlier reported that 13 terrorists have been killed.

The pandemonium in Marawi first erupted on Tuesday after extremists torched several buildings and battled state forces after the military attempted to arrest terror leader Isnilon Hapilon.

Hapilon is known to still be in the area.

The military launched surgical airstrikes in three barangays in Marawi City on Thursday to quell some 30 to 40 remaining members of the Maute group in the area.

President Rodrigo Duterte placed Mindanao under martial law on Tuesday following the clashes.