Pakistan has rejected as "unfounded" a terror alert in India that linked three men from Lahore to LeT, even as the trio sought protection from authorities after reports about them appeared in Indian media.

"These charges are mischievous and without any substance. We are looking into these unfounded allegations," a Foreign Office spokesperson was quoted as saying by media.

The spokesperson's statement came after Mumbai Police, in response to the alert issued by a central agency tasked with gathering external intelligence, released photographs of five Pakistani men identified as members of LeT who had allegedly infiltrated India to carry out terrorist attacks.

Three of the men whose photos were released by Mumbai Police – traders Mehtab Ahmed Butt and Atif Butt and private security guard Babar Shabbir – went to Gulberg police station in the heart of Lahore and sought protection from the authorities.

The traders and the security guard visited the police station with office-bearers and merchants of Hafeez Centre, a bustling market with shops that deal in mobile phones and computers, and brought the matter to the police's notice, ASP Tariq Aziz Sindhu said.

The trio said they were labelled as terrorists by Indian authorities even though they were present in Lahore and had never visited India.

The two traders said they were running mobile phone shops in Lahore's largest electronics and cell phone market.

The traders produced their Computerised National Identity Cards and recorded their statements in the police daily diary, Sindhu said.