New Delhi (Agencies): Taking on the Chinese who have shown Arunachal Pradesh as a part of their territory in an online map, Prime Minister Manmohan Singh said on Thursday that the state has always been an integral part of India and will remain so.

The "simple fact" was communicated by the Prime Minister to a delegation of All Arunachal Pradesh Students' Union which met him here on Wednesday, AAPSU president Takam Tatung said. 

"Arunachal Pradesh has always been an integral part of India and will remain so," Tatung reported Singh as saying.

On China issuing stapled visa to residents of Arunachal Pradesh, Singh said the Centre was putting its honest efforts to solve the problem at the earliest.

The Prime Minister said Arunachal Pradesh cannot remain out of mainstream and the fruit of development should reach there like in the rest of the country.

"During my visit to Arunachal Pradesh in 2008, creation of infrastructure in the state had been outlined and our governments both at the Centre and in the state are doing best to accelerate the pace of development," Tatung said quoting the Prime Minister.

The AAPSU delegation also brought to the notice of the Prime Minister the decades-old Chakma-Hajong issue in the state, insurgency in Tirap and Changlang, Assam-Arunachal boundary controversy and mechanism to monitor proper execution of all the government schemes in the state, Tatung added.