berlin german police arrest 19-year-old syrian suspect plan islamist-motivated bomb attack germany aim kill many people possible federal prosecutor office say tuesday interior minister thomas de maiziere say security officials avert major terrorist attack man identify yamen a. contact online jihadists include one describe soldier caliphate spokeswoman federal prosecutor office say yamen a. arrest early hours northeastern town schwerin police search home also people suspect directly involve accord find far yamen a. make decision late july 2017 detonate explosive device germany order kill injure many people possible prosecutor office say statement result begin procure components chemicals need make explosive device whether suspect already envisage specific target bomb attack still unclear office add order chemicals internet could use make explosive tatp short triacetone triperoxide spokeswoman prosecutor office late add also acquire two radio batteries cellphone battery suggest plan remote-controlled explosion radio mobile telephone indications member terrorist organisation office say say arrive germany chancellor angela merkel try form new coalition government elections last month come fire allow one million people enter germany past two years many refugees syria open door refugee policy saw conservatives bleed support election anti-immigration alternative germany afd seat national parliament first time de maiziere say raid suspect take place late enough secure evidence time early enough reliably ward danger threat situation germany remain high germany europe west sight islamist terrorism add statement german police arrest syrian suspect avert 'major terrorist attack