Copenhagen police said on Tuesday that a "suspicious" letter was being investigated at the cultural centre where a gunman opened fire at the weekend, killing one person.
"Ammunition experts called to Krudttoenden. That's normal procedure," Copenhagen police wrote on Twitter, with news agency Ritzau reporting that the letter contained messages linked to Saturday's attack.
GMT 07:51 2017 Tuesday ,25 AprilThird person killed in Venezuela protests
GMT 07:49 2017 Tuesday ,25 AprilArkansas kills inmate in latest of several planned executions
GMT 07:47 2017 Tuesday ,25 AprilTwo dead in latest protests across Venezuela: prosecutor's office
GMT 04:15 2017 Tuesday ,25 AprilUSGS: Central Chile hit by strong quake
GMT 04:10 2017 Tuesday ,25 AprilArkansas kills inmate in latest of several planned executions
GMT 04:06 2017 Tuesday ,25 AprilGovernment: Third person killed in Venezuela protests
GMT 20:19 2017 Monday ,24 AprilNasdaq hits record close as French vote boosts stocks
GMT 18:50 2017 Monday ,24 AprilICC unveils arrest warrant against ex-Kadhafi Libyan security chief