内容摘要："The cost of hiring places to rehearse is increasing and it is hard to find those cost effective locations," she said.

"The cost of hiring places to rehearse is increasing and it is hard to find those cost effective locations," she said.

A Ukrainian national security official said the incidents were Russian "false flag" operations, designed to "manipulate international opinion" ahead of peace talks between Russia and Ukraine in Turkey on Monday.Andrii Kovalenko, head of Ukraine's National Security and Defence Council's Centre for Countering Disinformation, accused Russia of "laying the groundwork to derail the negotiations".

He added Ukraine had "absolutely no incentive to sabotage the Istanbul summit".Russian President Vladimir Putin was briefed on the incidents throughout the night, the Kremlin said.Pictures online from Bryansk showed mangled carriages and passengers helping each other climb out of the wreckage in the dark.

Moscow's interregional transport prosecutor's office said an investigation had been launched.Authorities said the train's locomotive and several cars derailed when the road bridge fell on to it.

Additional emergency workers, as well as rescue equipment and light towers for carrying out work at night have been sent to the area, according to Russian news agency TASS.

The train was going from the town of Klimovo to Moscow and was in the Vygonichsky district when the collapse happened, officials said.Some participants were unable to speak to record their messages, so wrote them down or sent them by text, but others were determined to be heard.

"We extended the project for a month because people wanted to wait for that day when they could send a message," Ms Larkman said."Knowing how important it is for people to have their voice heard in these places, it feels like a real responsibility."

People who enter the box are invited to write a postcard to the person who recorded a message they listened to.It will be at the top of Troopers Hill, Bristol, on 1 June, under an oak tree at Ashton Court, Bristol, on 4 June, and at the top of Glastonbury Tor on 18 June.