Updated 09.00

Tyrone woman Michaella McCollum and Melissa Reid from Scotland, who are accused of drug trafficking in Peru, could face a six-month investigation if their guilty pleas are not accepted.

The Peruvian prosecutor in the case made the comment after McCollum and Reid made a second court appearance last night.

He didn't give details of the private hearing but suggested the women's confessions haven't yet satisfied prosecutors. The women have been asked to give 'clarifications' by the court after they asked for their sentences be reduced to 6.8 years.

The two were were arrested after 11.5 kilos of cocaine was found in their luggage at Lima Airport in August.

Their guilty pleas were last week rejected by prosecutors - who are demanding more information about the gang the women say sent them to Peru to act as drug mules - and full admissions of guilt.

They have spent the past month in a prison in the Peruvian capital city of Lima and had hoped their guilty plea would guarantee them a faster trial and a shorter jail term.

Reporter Martina Hanlon, who is in Peru, spoke to Newstalk's Breakfast: