Heavy rain and floods have left 11 dead in the central and southern Philippine islands, including in a city still reeling from deadly guerrilla attacks, civil defense officials said Tuesday.

Among the hardest-hit areas was Zamboanga City, where floods again displaced thousands of people who had previously fled their homes to escape three weeks of fighting between Muslim rebels and government forces.

Discussions over proposals to expand the American military's presence in the Philippines failed to reach a deal, Filipino officials said Thursday, a day after U.S. President Barack Obama called off a Manila visit.

The plan would allow more U.S. troops, aircraft and ships to temporarily pass through the Philippines, an Asian military ally, at a time when Washington is refocusing its attention on Asia.

The Philippines on Thursday completed its transformation from one of Asia's weaker economies after Moody's became the third and final ratings agency to grant the country investment-grade status.

The decision to give Manila a Baa3 rating with a "positive outlook" follows similar moves by Standard & Poor's and Fitch earlier this year.

Philippine troops hunted the remnants of a Muslim rebel group in the key southern city of Zamboanga Sunday, with residents hearing gunfire a day after the military declared an end to its three-week campaign.

The army Saturday announced that police were taking over from troops to clear sections of the vital regional trading center of Moro National Liberation Front (MNLF) stragglers.

Miss Philippines was Saturday crowned Miss World 2013 in a glittering finale on the Indonesian resort island of Bali amid tight security following weeks of hardline Muslim protests.

As hundreds of Muslim hardliners held a prayer session in a mosque near the capital to express their anger at the contest, Megan Young wept as she won the coveted title in the final on Hindu-majority Bali.

A military campaign against Muslim gunmen opposed to peace talks ended Saturday with close to 500 rebels killed or captured and nearly 200 hostages freed in a key southern city, the army said.

"The threat to Zamboanga is over. The enemy has no organized resistance left," military spokesman Lieutenant-Colonel Ramon Zagala told AFP on the 20th day of operations.

The United Nations warned Wednesday that the southern Philippine city of Zamboanga faces a humanitarian crisis, with tens of thousands of people uprooted by a wave of deadly violence.

Hundreds of soldiers and police have been engaged in combat since September 9 when about 200 Muslim guerrillas entered the city in the most serious armed challenge to the Philippine government in recent years.

Monsoon rains worsened by Typhoon Usagi pounded the Philippines for the third day on Monday, causing floods and landslides that left 18 people dead and others stranded on rooftops, officials said.

The most severely affected area was the province of Zambales, about 80 kilometers (51 miles) northwest of Manila where heavy rains caused rain-soaked soil to cascade down, killing 17 people in different parts of the province, said assistant civil defense director Nigel Lontoc.

Muslim rebels clashed with troops and took hostages in a fresh outbreak of violence in the strife-torn southern Philippines on Monday, officials said.

The fighting in the center of Mindanao island came even as a standoff with another Muslim armed group elsewhere in Mindanao entered its third week.

Philippine President Benigno Aquino on Sunday flew out of a major southern city where troops are fighting Muslim rebels, saying he expects the deadly battles to be over soon.

"I believe this will wind down within the day," he said before boarding a jet that flew him out of Zamboanga, where thousands of elite troops have been fighting Moro National Liberation Front (MNLF) gunmen for two weeks.