New Delhi, July 28 - Construction major Gammon India may get blacklisted for a period of two years for the Delhi Metro mishap that killed six people July 12, Urban Development Minister S. Jaipal Reddy informed parliament Tuesday after a probe panel found fault with the design and materials used in the construction.

Reddy said the probe panel, headed by IIT-Delhi professor A.K. Nagpal, found 'serious deficiency in the design of the cantilever arm and the concrete (used in the construction) not having the adequate strength'.

The minister also informed the Lok Sabha that the Delhi Metro Rail Corporation (DMRC) has decided to blacklist its design consultants and crack down on some senior officials.

The design consultant, Arch Consultancy Services, has been blacklisted for five years, while the structural consultant, Tandon Consultants, which did not give 'correct advice' to DMRC is being debarred for two years, he said.

'Gammon India will be issued a show-cause notice. It will be asked why it should not be blacklisted,' Reddy said in the Lok Sabha.

Gammon India, which is the contractor of the Central Secretariat-Badarpur line where the mishap occurred, is also in charge of building the Yamuna Bank-Noida stretch of the Delhi Metro.

On July 12, an under construction elevated section of Delhi Metro in Zamrudpur in south Delhi collapsed killing six people and injuring 15 others.