Why was Nayanthara detained at KL airport?

Pretty damsel Nayanthara had flown to Malaysia to join Chiyaan Vikram for shooting of their upcoming movie, Iru Mugan. Unfortunately, the actress was detained at the Malaysian Airport. Rumours started spreading fast regarding her ���detention���, including talk of her being caught with drugs.
Other reports also claimed that she was detained as her name did not match with the one on the passport, as the actor���s real name is Diana Mariam Kurian.Clarifying on the issue, an officail statement said, ���Work permit rules in Malaysia are different in the two airport terminals. Usually travellers to India travel through KL1. But, the new airline Malindo operates from KL2. There the immigration officials sought few clarifications regarding her work permit and the visa stamping for her team."
The production team and line producers of 'Iru Mugan' have lodged a complaint with the immigration dept for snaps of Nayanthara and her passport copy getting circulated online which lead to false speculations and rumor.