Hoshiarpur, Punjab:  Four students from a school in Garhshankar in Punjab's Hoshiarpur district have gone "missing" in the United States during their educational trip to the National Aeronautics and Space Administration (Nasa). The teacher who accompanied them did not return either, but sent an e-mail saying that she had got married.

The incident comes hot on the heels of two students from a leading Jalandhar city school who went missing during an educational trip to the US.

The management of the Doaba Public School at Parowal on the outskirts of Garhshankar town, 45km from here, have filed a complaint with the Punjab police that four of their students, all aged between 14 and 15 years, went missing on a school educational trip for a Nasa rocket project last month.

A teacher, Minu Sharma, who accompanied the 19 students along with the school vice principal Harpreet Kaur, also did not return.

Sharma has now sent an e-mail to the school authorities saying that she had got married in the US and wanted leave for one month.

The students who have gone missing are Sumit Sahni, Baljinder Singh, Dalbir Singh and Arshdeep Rahil. All of them are from villages near Garhshankar town.

"We have filed a complaint with the police here. Our delegation leader also informed the US homeland security officials and the Indian embassy about the four missing students there," school principal Balwinder Kaur said.