The incident, which took place on Sunday, came to light a day after the conclusion of the 'Paryatan Parv', India's biggest tourism festival which aimed at increasing the tourist footfall in the country.
"You would kindly appreciate that such incidents negatively impact our image and are detrimental to our efforts in promoting India as a tourism destination," Alphons wrote in his letter to Adityanath.
In his letter to the Uttar Pradesh chief minister, Alphons said he was "deeply concerned" over the attacks.
"A fast and speedy response in identifying and ensuring speedy action, including conviction of the guilty, would be reassuring, as also a good message of our efforts to prevent recurrence of such incidents," the minister wrote.
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"I think the foreign minister has reacted to it. It is a matter of law-and-order, but as the culture minister and a human being, I condemn the attack on the foreign tourists. It is unfortunate and should not have happened. It is a matter of shame for us," he told PTI.
External Affairs Minister Sushma Swaraj has sought information from the Uttar Pradesh government on the incident.
According to the National Crimes Records Bureau (NCRB), crimes against foreign tourists had reduced by 29.4 per cent in 2015 as against the previous year.
In 2014, 384 of such cases were reported from across the country, the NCRB said, adding that the number came down to 271 in 2015.
These findings are part of the first analytical report of the NCRB on crimes against foreign tourists. The bureau has been profiling such crimes since 2014.
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