Protesters have barricaded themselves inside Taiwan’s parliament for a third straight day, threatening “further action” if the government pushes ahead with its plans to ratify a contentious trade pact with China.

More than 200 protesters – mostly young students – stormed through security barriers and took over the parliament’s main chamber late on Tuesday in the first such occupation of the building in Taiwan’s history.

Hundreds of police officers attempted to barge their way in on Wednesday and end the occupation, but they failed to breach the improvised barricades fashioned by the students out of piles of armchairs.

As the stand-off entered a third day on Thursday, student leader Chen Wei-ting said the protesters would lead to “further action” unless President Ma Ying-jeou responds to their demands by Friday.

“We demand that the service trade pact – and any other agreements or negotiations with China – be halted until a bill is passed to scrutinise such deals,” Chen told the protesters, whose antics have been broadcast around the clock by Taiwanese TV networks.

“We ask President Ma Ying-jeou to respond to our demands by noon Friday or we will take further action,” Chen added, as the crowd chanted “return the service trade pact, defend democracy”.

The president’s office declined to comment on the demands, saying only that it supports the parliament’s efforts to “properly handle the situation in accordance with the law”.

The protesters have vowed to occupy the parliament until Friday, when MPs are set to hold a full session to review the pact.

Signed in July, the agreement is designed to further open up trade in services between China and Taiwan, which split 65 years ago after a civil war.

The protesters say the deal will damage Taiwan’s economy and leave it vulnerable to political pressure from China.

Taipei’s police force has deployed some 2000 officers to the parliament, who are guarding it in shifts as around a thousand more protesters remain in its grounds.

Police said 38 officers received mild injuries attempting to force their way back into the chamber on Wednesday.

Parliament speaker Wang Jin-pyng on Thursday pledged to resolve the situation with “appropriate methods”.