India, June 30 -- Football fever has swept Bangladesh as the FIFA World Cup enters its Round of 32, with homes and streets across the South Asian nation draped in the flags of football giants, particularly Argentina and Brazil, in celebration of the global sporting event. Amid the football frenzy, however, the reappearance of white flags bearing the Kalema (the Islamic declaration of faith) in Dhaka and several other cities has raised concerns among police and security experts.

The flags resemble those that have been used by international extremist groups such as Al-Qaeda and ISIS, prompting authorities to closely monitor the situation.

According to a report by Dhaka Tribune, rows of white flags with Arabic inscriptions have appeared ov...