The incident comes only two weeks before the opening of the Commonwealth Games in New Delhi and security has been tightened in the capital, with authorities mindful of attacks in Indian cities over recent years in which dozens have been killed.
The condition of the two wounded tourists was not immediately known. CNN-IBN television reported that the foreigners were Taiwanese, but police could not confirm their nationality.
'The two men were wearing helmets and raincoats. They fired indiscriminately at a tourist bus before escaping,' K. Singh, a senior police officer in Delhi, told Reuters.
'There was some firing outside gate number 3 of Jama Masjid (Delhi's main mosque),' Delhi police spokesman Rajan Bhagat told Reuters. 'We can't say (whether it was a militant attack).'
'Two foreigners have been injured. A few rounds have been fired by unidentified gunmen.'
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