Officials in the Mexican capital on Tuesday announced the suspension of operations along a stretch of the metro's new No. 12 line to allow for repairs of structural defects.

The decision to halt operations at midnight Wednesday on the elevated stretch of track from the Tlahuac station to Atlalilco is designed to guarantee the safety of riders, the director of the STC-Metro system, Joel Ortega, said.

"It's not possible to maintain operations on the elevated stretch of Line 12, unless the necessary corrections and better maintenance are (put in place)," he said at a press conference.

Line 12, which was inaugurated in October 2012, has structural defects, Reforma newspaper said, citing a report from the firm ILF Consulting Engineers.

A waviness in the rails along the 14 kilometers (about 9 miles) of track between the Tlahuac and Atlalilco stations has caused damage to the wheels of metro trains such that six of the 30 trains are out of service.

The unevenness in the rails results in strong vibrations and caused an electric cable to fail, not to mention creating cracks in the ties and fractures in the supports for the track.

Authorities said that 300 buses will be used to temporarily replace service along Line 12.

In addition, Ortega said that a review of possible legal liability in connection with the defects on the line had been requested.

Line 12, which required an investment of $1.7 billion, was built by a consortium comprised of France's Alstom and the Mexican companies ICA and Carso.

The line is 25.1 kilometers (15.6 miles) long with 20 stations, eight of which are underground, and it passes through seven boroughs of Mexico City. EFE