Zamboanga - which also came under siege for nearly a month in September 2013 when members of a Nur Misuari-led faction of the Moro National Liberation Front attacked the city - is located about 400 kilometers from besieged Marawi City.
He also called the Maute siege of Marawi City an attempt to undermine his control over executive departments, bureaus and other offices in the area; defeat his mandate to ensure that all laws are faithfully executed and remove his supervisory powers over local governments.
"They have not been successful and we are committed not to make them succeed", he said.
Hundreds of civilians had sheltered in a military camp in Marawi City as troops helped clear the few remaining people from streets where smoke lingered in the air.
The Maute, Abu Sayyaf and other small hardline groups are not interested in negotiating and have in recent years looked to IS to help them.
They "may not have ever experienced being shot at by someone or being forced to evacuate to a safe place or to [cross] a river in order to reach sanctuary or to lose a job or livelihood or loved members of the family", Ramos said.
President Rodrigo Duterte has imposed 60 days of martial law on the island of Mindanao, a traditional homeland of minority Muslims that encompasses the southern third of the nation and is home to 22 million people.
Singaporeans are among the foreign nationals fighting alongside the Islamic State-linked Maute group in Marawi City, a Philippines armed forces spokesperson said on Friday (May 26).
As authorities tried to gain more control over the city, disturbing details have emerged.
"If you raped three (women), I will be the one to admit that it's me", Duterte said. But he said six foreign fighters are believed to have been killed in the Marawi fighting, including Malaysians, Indonesians and another nationality which he did not specify.More news: Bloomberg Pledges $15 Million To Help Prop Up Battered Paris Climate Deal
"We believe they're now low on ammunition and food", he said, speaking by phone from Manila, the capital. A paper sign attached to one of the men indicated that the victims had "betrayed their faith", he said, identifying the men as civilians. Marawi is a predominantly Muslim city following purist school of thought of Islam.
More than 44 people have died since terrorists launched their attack Tuesday against the city of Marawi on the island of Mindanao.
A military spokesman says troops are using helicopters to help clear militants from the besieged city of Marawi in the southern Philippines.
Ucanews.com reported that religious leaders and civil society groups, however, said there was no need for Duterte to put Mindanao under military rule.
Solicitor General Jose Calida, however, said Ramos' unsolicited advice "is not practicable at this time".
"People they consider as infidels, whether Christians or Muslims, are also targets", he said.
Authorities are working to determine the condition of a Catholic priest and worshippers who were taken hostage by gunmen earlier this week.
Philippines President Rodrigo Duterte has all but given his soldiers carte blanche in the battle against Islamic State-affiliated Maute fighters, even joking he'd take responsibility if his soldiers violate citizens' rights in Mindanao, including by committing rape.
While Indonesia has been fighting militants since 2002, the rise of the Islamic State group has breathed new life into local militant networks and raised concern about the risk of Indonesian fighters returning home from the Middle East.
The United States regards Hapilon as one of the world's most risky terrorists and has offered a bounty of $5 million for his capture.