'Air rifle' probe over Central Line Tube train attacks
Passengers travelling on the Central Line were left "shaken" after windows were broken when trains came under attack in east London, police said.
Officers are investigating whether an air rifle was involved in the attacks on moving trains between Leyton and Stratford on Wednesday evening.
Eight trains were damaged and windows shattered, Transport for London said.
A police spokesman said they were treating it as stone throwing but had not ruled out the use of an air rifle.
Services on the route were disrupted for about three hours.
A BTP spokesman said: "BTP officers were called to the line between Stratford and Leyton London Underground stations at about 5.55pm on Wednesday 16 March after reports of stones being thrown at passing trains.
"A number of Central Line train windows were smashed, although no injuries to passengers have been reported.
"An investigation has been launched and officers are working to establish the full circumstances surrounding the incidents, including establishing exactly what was used to smash the windows.
"These incidents left passengers on board the trains understandably shaken," he added.
No arrests have been made but a search of the area was carried out, the spokesman said.
A TfL spokeswoman said: "The railway is not a playground. Throwing things at trains is not only dangerous but can have serious - and sometimes fatal - consequences."