A man has been accused of stabbing two teenagers with a metal fork during a flight from the US to Germany.

Praneeth Kumar Usiripalli, 28, was on a Lufthansa flight from Chicago to Frankfurt on Saturday when he allegedly attacked two 17-year-old passengers, Sky News' US partner network NBC News reports.

One boy was asleep in a middle seat when he woke up to Usiripalli standing over him with the fork following a meal service, federal prosecutors said.

Usiripalli is accused of lunging at him and striking him in the left collarbone, before stabbing another teenager in the back of the head.

The second teenager suffered a laceration to the back of the head, the US Attorney's Office in Massachusetts said in a statement.

When crewmembers tried to stop Usiripalli, he is said to have formed

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