While offers of aid for the Philippines pour in from around the world following the devastating impact of Typhoon Haiyan, Hong Kong has vowed to press ahead with sanctions on Manila over a 2010 hostage crisis.

The threat has sparked outrage among some Hong Kongers and the city's Filipino migrant workers, whose homeland is reeling from the impact of the record-breaking typhoon that killed thousands and devastated entire coastal communities.

The United Nations has appealed for $301 million of aid, with the US and Britain among leading donors and China on Thursday stepping up its initially modest response to dispatch rescue materials worth $1.6 million.

But the southern Chinese city, a former British colony that is now semi-autonomous, has refused to drop its warning of impending economic sanctions unless the Philippines offers a formal apology for a 2010 hostage crisis.

Eight Hong Kongers were killed and seven others wounded in the incident after negotiations broke down between Philippine authorities and a former police officer who hijacked a Manila tour bus.

Last Tuesday, the city's leader Leung Chun-ying said he will take "necessary actions to apply sanctions" if he does not see concrete steps taken to resolve the issue within a month.

Asked Wednesday if the disaster would impact on the deadline, Hong Kong's Chief Secretary Carrie Lam said: "At this moment, we don't have this intention."

Lam added that the hostage situation and the devastation in the Philippines caused by Haiyan were "entirely separate issues".

The remarks angered some Hong Kong web users and the city's Filipino community, who number some 150,000.

"I am ashamed to call myself a Hong Konger and I hope the vast majority of Hong Kongers also feel the same, particularly with the government's callous and insensitive attitude on display to the world," a user called 'bloodyfool' commented online.

Another named 'shayliu', said: "This government does not serve or represent the general HK population."

Benjamin Panganiban, a director of the Philippine Association of Hong Kong said the remarks were "inappropriate", adding: "After the aftermath of what happened in the typhoon, maybe we can delay that deadline."

The city's unpopular government is under pressure not to upset groups affected by the hostage situation.

Philippine President Benigno Aquino has refused to apologise on behalf of the country for the Manila hostage situation, insisting the deaths were primarily caused by the actions of the hostage taker.

The city's lawmakers have mooted a cancellation of its visa-free arrangement for visitors from the Philippines as well as possible trade sanctions.

In a response to the disaster, the Hong Kong government plans to boost its existing reserve for overseas disaster relief from HK$9 million to HK$49 million (US$6.32 million), which aid groups can then apply for.