Bijnor/New Delhi Apr 3 (PTI) Two unidentified motorcycle -borne assailants shot dead a National Investigation Agency (NIA) official, who was part of several terror probe cases related to Indian Mujahideen, and critically wounded his wife in the wee hours today when they were returning home from a wedding near this Uttar Pradesh town.

The killers pumped as many as 24 bullets into Mohd Tanzil Ahmad and four into his wife Farzana, as their 14-year old daughter and 12-year old son watched the gruesome incident from the back seat of the Wagon-R car they were travelling in, police said, adding the children were not injured.

Ahmad was returning home in Sahaspur village of Bijnor district with his family after attending his niece's wedding in another nearby village in the same district, which is about 150 km from Delhi.

Police termed the killing of Ahmad, posted as Inspector initially with the NIA's intelligence wing and later in its investigation department, as a "planned attack" and did not rule out the possiblity of a terror angle behind the shootout.

Home Minister Rajnath Singh told reporters in Lucknow that he had been apprised of the incident. "Whatever necessary is being done. We are talking (to NIA officials)," Singh said.

Police suspect that Ahmad's movements was being tracked the assailants who used at least one 9mm pistol in the shootout.

"Tanzil Ahmad was shot dead by two motorcycle borne persons when he was returning after attending a marriage ceremony with his wife Farzana," IG (Law and Order) of UP Police Bhagwan Swaroop said.

The incident took place at 12:45 AM when Ahmed, earlier posted as an assistant commandant in BSF and on deputation to NIA, was returning to Sahaspur from the wedding ceremony.

45-year-old Ahmad, who has been with the NIA ever since the organisation was formed in February 2009, had been investigating many cases especially related to banned Indian Mujahideen terror outfit. His superiors termed him as a thorough professional in intelligence gathering as well as investigation.

According to the police, Ahmad left his home in the evening along with his family to attend a marriage ceremony at a guest house at Sohara village. On their way back, their vehicle was stopped barely 200 metres from his home by two youths who fired at a very close range.