Labour Secretary Silvestre Bello told reporters Wednesday one of his deputies would lead the delegation, which is also due to stop in Saudia Arabia and Qatar to urge reforms.
Agreements on trade, investment and agriculture sectors signed
Duterte has denied the allegation. On Monday his spokesman Harry Roque said the president's chief aide had suspended the deputy Ombudsman, Melchor Arthur Carandang, for three months.
Rising majestically above the region, the perfect cone of Mayon has been generating giant cauliflower clouds of superheated ash and bursts of fireworks-like lava for nearly two weeks, with experts warning of more.
More than 56,000 residents are now crammed in schools and other buildings two weeks after Mayon volcano began showing signs of unrest.
Fine ash and sand fell on Legazpi, a city of about 200,000 people, and nearby areas after the midday explosion turned the area into virtual nighttime, forcing motorists to switch on their lights and use windscreen wipers, an AFP video stringer said.
Rappler, set up in 2012, is among a clutch of Philippine news organisations that have sparred with Duterte over their critical coverage of his brutal drugs war.
Thousands flee to safer grounds in fear of possible hazardous eruption of Mayon volcano
Hundreds evacuated as restive Mayon volcano spews ashes
Arrests made in response to China's request over reported cyberfraud
He said he made the promise during a meeting on Monday night with the families of those killed in a shopping mall fire in the southern city of Davao.
Tropical Storm Tembin on Friday struck the country's main southern island of Mindanao, which often escapes the 20 or so storms that batter the rest of the archipelago nation each year.
Paolo Duterte tenders resignation amid drug smuggling allegations, squabble with daughter
Almost 300 persons remain missing, dozens injured at the onslaught of the typhoon.
Firefighters rushed to the scene after receiving a 9:00 am distress call, took until Sunday morning to put out the blaze
Some 200 passengers safe and accounted for, but search and rescue operations are ongoing, say officials
11 people confirmed dead on Sunday, while some 30 others are feared buried alive in landslide due to Tropical Storm Urduja
Electricity and communication lines down, thousands of passengers stranded by Tropical Storm Urduja
Duterte's request, which is expected to be approved this week, added to critics' fears that the 72-year-old leader is seeking to steer the Philippines back into dictatorship.
Regulators froze the Philippines' world-first public dengue immunisation programme last week and suspended all sales of the vaccine on Monday after Sanofi said Dengvaxia could worsen symptoms for vaccinated people who contracted the disease for the first time.
New halal facility scheduled for grand opening during Maguindanao’s Inaul Festival in February