Besides banning exclusivist foreign preachers from entering Singapore, local authorities could go a step further to regulate overseas trips organised by religious institutions to attend sermons or lectures by such preachers, said Malay-Muslim community leaders.

The Internet has allowed people to hear from religious preachers, without having to be physically present at their lectures or sermons, said Dr Mohamed Ali, who is the vice-chairman of Religious Rehabilitation Group.

Even so, regulations on overseas trips conducted by mosques and private Islamic organisations for Singaporeans to attend lectures by foreign preachers could be considered, said Dr Mohamed, an assistant professor at the S. Rajaratnam School of International Studies.