Sources said that immediately after the alarm was sounded, security at all vital installations, including the Pathankot air base in Punjab, was enhanced to the highest level to make it difficult for the terrorists to mount an attack.
"We suspect the terrorists must have entered the air base in the morning of January 1 while the alert was sounded a few hours later in the evening," they said.
Sources said that police officers whom the SP had informed about the terrorists initially did not take him seriously, thus leading to some crucial hours being lost.
Security agencies are suspecting there were six terrorists and they were divided into two groups -- one of 4 and the other with 2 members.
The four in the first group were killed on Saturday while the two members of the second group were fighting till today.
Sources, meanwhile, added that the level of training of the Pathankot terrorists seems even better than that of the Mumbai 26/11 attackers. It is clearfrom the tactics that these terrorists have employed that a professional army had trained them, they said.
The terrorists used all the tactics of professional fighters like conserving firepower, attacking at 3 AM when the level of alertness is at its lowest and going quiet to give the impression that all the attackers had died. All these tactics are of military precision, the sources said.
The National Investigation Agency, which will probe the Pathankot attack, will also probe the killing of the driver and the kidnapping of the SP.
NIA is already questioning the SP and his cook, who was also in the vehicle. The SP had first given the information that there were four terrorists.
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