Residents of flooded farming villages in the Philippines were trapped on their rooftops on Monday and animals floated down fast-rising rivers, as deadly Typhoon Koppu dumped more intense rain.

Koppu, the second strongest storm to hit the disaster-plagued Southeast Asian archipelago this year, has killed at least two people and forced more than 60,000 people from their homes, authorities said.

The coast guard says a passenger motorboat with 41 people on board capsized in central Philippines in a storm, leaving seven dead and two others missing.

A coast guard report Monday said the boat Tawash was on its way to to Guimaras province with 36 passengers and five crew members when it capsized.

A teenager was crushed to death as powerful Typhoon Koppu tore down trees and houses and unleashed landslides and floods across a wide area of the Philippines on Sunday, forcing thousands to flee.

At least eight other people have been reported missing and military and volunteer rescue teams were dispatched to the rice-farming province of Nueva Ecija where rivers burst their banks and flooded several villages, authorities said.

Philippine authorities on Saturday warned that a powerful typhoon will likely linger over the country for almost three days, bringing prolonged heavy rain, possible floods and sparking storm surges.

Hundreds of people have already been evacuated from the northeastern provinces in the face of the approaching Typhoon Koppu, possibly the second most powerful storm to strike the disaster-prone country this year, civil defense officials said.

A roadside bomb killed four people in a Filipino politician's convoy Thursday, while a separate bus blast left a dozen injured in the country's strife-torn south, authorities said.

The first explosion on Basilan island killed three bodyguards of local official Abdulbaki Ajibon and a fourth person, they said.

Gunmen holding three foreigners and one Filipina hostage have slipped past a naval cordon and escaped to remote mountains in the southern Philippines without making ransom demands, police said Wednesday.

Elite army troops were trying to track the bandits while air force helicopters were readied for a possible rescue as the abductors trekked into Davao Oriental province, a hotbed of Maoist and Islamic rebels, said Senior Superintendent Aaron Aquino, the region's deputy police commander.

Philippine President Benigno Aquino on Tuesday joked about China's disputed maritime territorial claims and praised Beijing's regional rival Japan for passing new legislation allowing the nation's troops to fight abroad.

Speaking in an interview with ABS-CBN television, Aquino said that China had proposed the joint development of the South China Sea while at the same time claiming almost all of the strategically sensitive waters.

A Muslim extremist group known for beheading some victims has released a group of kidnapped road workers following an intense police and military pursuit in the southern Philippines, an official said Tuesday.

The 11 hostages were seized by the Abu Sayyaf on Monday while on their way to work at a road project funded by the government on the remote island of Basilan.

Muslim extremists with a history of beheading their captives abducted 11 workers on a government road project in the strife-torn southern Philippines on Monday, the military said.

The workers were escorting a water truck to the project on the island of Basilan when members of the Abu Sayyaf group waylaid them and took them into the surrounding jungle, a statement from the island's military unit said.

Beijing must offer more than hollow promises if it wishes to secure peace in the disputed South China Sea and beyond, a spokesman for the Philippine defence department said Sunday. 

The remarks came days after China flaunted its military might with a massive parade to mark the end of World War II, though President Xi Jinping said at the event his country was dedicated to peace and does "not seek hegemony".