German police have put in place extra security measures ahead of Real Madrid's Champions League quarterfinal at Bayern Munich, and UEFA said that security was being reviewed at all three of Wednesday's Champions League games.
The extra security measures come one day after Borussia Dortmund's team bus was targeted by a bomb attack travelling to its home stadium. A note left at the scene suggested a possible Islamic extremist motive for the attack, and one suspect has been detained, German prosecutors said on Wednesday.
Authorities in Munich have changed their plans ahead of Wednesday's match at the Allianz Arena, with Real Madrid's team bus now to be given a police escort during its prematch journey. An additional 80 security personnel have also been added to duty at the stadium.
UEFA said a security review is being conducted by "police, security services, stadium management and the clubs involved" in Germany and Spain.
Two are being played in Germany: Dortmund's match against Monaco rescheduled from Tuesday, and defending champions Real Madrid playing at Bayern Munich. In Spain, Atletico Madrid host Leicester.
"Security procedures will be enhanced accordingly wherever needed," the European football body said in a statement that asked fans attending the games to prepare for additional security checks.
A statement from the Munich Police sent via Twitter said there was no reason to suspect anything might happen, but given the circumstances they had moved to provide extra protection.
.@realmadrid @FCBayern @policiademadrid #München #bvbasm #fcbrma pic.twitter.com/ouHsLnbCSD
- Polizei München (@PolizeiMuenchen) April 12, 2017
"With calm conscience, we can reassure you that we can guarantee a very, very high security standard inside the stadium and on the routes to the stadium," the statement said.
"Because of the incidents in Dortmund, we give thought to how we can protect the teams and the transport of the teams to the stadium even better. We already increased our presence in the areas around the team hotels last night, and we increased the number of police working the football match from 370 to currently 450.
"We are in a constant information exchange with Dortmund police and other security services. We have already ensured that the busses used for their transport have been integrated into our security concept even more.
"It has to be highlighted that there is no concrete threat for both teams or the fans here in Munich."
After arriving in Germany on Tuesday Madrid's players travelled the five kilometres from their hotel to the stadium for the prematch training session as usual, but El Pais reported they were then given a police escort for the return journey as reports had emerged of the incident approximately 500 kilometres away in Dortmund.
El Mundo reported that German police have met with members of Madrid's club security staff, and that the bus is likely to take a different route to normal when it makes its way to the stadium prematch on Wednesday afternoon.
UEFA said it had "no specific intelligence regarding any threat to tonight's matches."
"[W]e would like to assure teams, officials and supporters that UEFA always insists upon the highest standards of safety and security arrangements for competition matches, and that the safety of everyone attending UEFA's matches is our highest priority,'' the statement said.
Three explosions went off near the bus carrying Dortmund's team to their scheduled game against Monaco on Tuesday. The bus had just left the team hotel in the city about 90 minutes before kickoff.
Information from The Associated Press was used in this report.