Taiwan authorities have tightened security following a Twitter post that seems to have implied Taipei's landmark building could be targeted by Islamic State (IS) militants.

The island has been on alert since a Twitter account believed to be connected to IS posted a photo on the microblogging site Tuesday which shows a city in ruins with a building that appears to be the Taipei 101 tower, formerly the world's tallest building, in flames.

"When Islamic State attack your cities it won't look nice. By the permission of Allah that day is not far," reads the post.

The Twitter account was suspended shortly after the tweet.

Taiwan "Cabinet" spokesman Sun Lih-chyun told the Global Times Thursday that the authorities have been on heightened alert after learning about the post, and will keep a close watch on the situation in cooperation with related departments such as the "Immigration Agency" and the "Ministry of National Security." The related departments are currently tracking the source of the post and analyzing the situation, he said.

Luo Shou-he, spokesman for the "Ministry of National Defense," was quoted by Taiwan's Central News Agency Wednesday as saying that the photo needs further analysis so it can be determined if it was intended as a threat toward Taiwan, and that his "ministry" will kick off anti-terrorist operations in coordination with other government agencies if necessary.

A representative of the Taipei City Police Department told the Global Times Thursday that security has been tightened around Taipei 101, and that the police have set up a communication channel with the management of the tower.

The picture tweeted by the alleged IS-affiliated account is one of a series produced by artist Jonas De Ro in 2013.

De Ro also depicted Tokyo, Singapore, Shanghai, Dubai and Moscow in ruins.

According to reports, Taiwan's security bureau has been cooperating with international intelligence agencies in order to compile a list of terrorists as part of their efforts to keep extremist groups out of Taiwan.

The director of Taiwan's security bureau Lee Shying-jow recently presented a list of 52 international terrorists who were denied entry into Taiwan between 2013 and 2014 to the "Cabinet."

China Times, a Taiwan-based media outlet, reported Wednesday that the American Institute in Taiwan last year praised Taiwan's contribution in the alliance against the IS, which includes financial aid and building settlements in Northern Iraq to accommodate refugees from the country and neighboring Syria.