The around 15-feet-long tunnel having its opening in the bank's strongroom was uncovered yesterday by bank employees.
"The robbers dug the tunnel from behind the bank and entered into the strongroom from there they took away Rs 70 lakh on Sunday night," Additional SP Ganpat Lal said today.
Investigations suggest involvement of some labourers who were engaged in construction work near the bank for some time.
The police, however, did not rule out possibility of involvement of any bank employee in the case but the probe is revolving around some labourers as of now.
