Guwahati, June 26 :    Guwahati, June 26:  The severed head recovered at Hudompur Dokhola yesterday has been identified as that of an Ulfa activist, Parameshwar Das, from Hajo in Lower Assam?s Kamrup district. This has almost proved the involvement of ?secret killers? in the mysterious happenings at this sleepy hamlet on the banks of the Brahmaputra. A number of Ulfa leaders and their relatives have fallen victim to ?secret killers? in the last few months. Among them are the brothers of Ulfa chairman Arabinda Rajkhowa, top hitman Munna Mishra, family members of publicity secretary Mithinga Daimary and senior Ulfa activist Babul Ingti. An Ulfa leader was also picked up by unidentified persons from Shillong and later killed. These killings appeared to have stopped after ?unidentified persons? gunned down state agriculture minister Chandramohan Patowary?s brother in the city and shot at a sibling of health minister Kamala Kalita near Chaygaon. But now it appears that the killings are still on, only the modus operandi has changed. Instead of leaving the bodies at easily recoverable places, they are being dumped at places where the chances of recovery are remote. However, a senior police official ruled out the involvement of ?secret killers? hinting that the militant outfit itself may have killed Das. According to him, Das, who was the assistant finance secretary of the Ulfa?s Hajo unit, ?had swindled a huge amount of money.?? This money had been hidden in some unknown place even before Das was arrested in 1997, the police officer said. After he was released on bail, his movements were ?suspicious,? the police officer claimed, adding that Das soon jumped bail and rejoined the militant outfit. But he failed to explain why or how Das had rejoined the Ulfa ranks after swindling this ?huge amount of money.? Sources said the head was severed from the body ante-mortem. The police officer also claimed that Das? body was not dumped at Hudompur Dokhola but had floated down from elsewhere. That is why, he explained, the head was recovered in the main river (Brahmaputra) while the rest of the body was found in a canal flowing into the river. Asked how he ruled out the possibility of the head flowing out of the canal into the river, he replied that police was present in the area to prevent such dumping of bodies. ?The severed leg was recovered around 4.30 pm on June 22 while Das was missing from his residence only around 11.30 pm on the same day. Immediately after the recovery of the leg, police personnel had been posted in the area,? he said. ?No fool would have dumped the body in the area in the presence of policemen,? he claimed. However, villagers claim that the police patrol the area only till 8.30 pm and the ?mysterious? people come to dump the bodies much later in the night. They said some people come in Maruti Gypsys under cover of darkness and dump the bodies in the area to be swept away by the Brahmaputra. Before the severed leg was recovered on June 22, people had spotted blood stains on the river bank, fuelling suspicion that bodies were being dumped in the area.