Three explosions hit Borussia Dortmund team bus

Centre-back Marc Bartra injured and in hospital

Letter 'takes responsibility for the act'

Match against Monaco delayed until Wednesday

Borussia Dortmund fans offer stranded Monaco supporters accommodation

Who is Marc Bartra?

Borussia Dortmund's team bus was hit by three explosions while on its way to the Champions League quarter-final first leg match against Monaco on Tuesday evening, leaving one player injured in hospital.

German security sources said it was a targeted attack on the team bus, shattering one of the vehicle's windows. Police said "serious explosive devices" were used.

A letter found near the site of the attack "takes responsibility for the act", a German prosecutor said.