With Pakistani troops violating the ceasefire again by resorting to cross-border shelling, India on Thursday night described the developments as "unacceptable" and said these vitiate the atmosphere between the two countries.

"It is a matter of concern," Minister of State for External Affairs Anand Sharma told PTI when asked to comment on yet another incident involving Pakistani shelling on Indian positions in Nowshera in Jammu and Kashmir early on Thursday morning.

Pakistani forces resorted to intermittent firing of mortar shells in Jhangarh area of Nowshera sector in Rajouri district for 45 minutes from 0640 hours, marking the 27th violation since January this year of the five-year-old border ceasefire pact.

"It is unacceptable. This does not help improve the relation but vitiates the atmosphere," Sharma said reflecting the Indian government's anger over continued provocations despite repeated calls from New Delhi to desist from such actions.

The minister noted that Prime Minister Manmohan Singh had himself "clearly and firmly" conveyed India's concerns to his Pakistani counterpart Yousuf Raza Gilani in Colombo on the margins of SAARC Summit earlier this month.