Germany's opposition leader has vowed to bar people from entering the country without proper papers and to step up deportations if he is elected as chancellor next month, as a knife attack by a rejected asylum-seeker spills over into an election campaign in which he is the front-runner.

German police say two people, including a two-year-old boy, were killed and two others were severely injured in a stabbing attack in Bavaria.

A two-year-old boy and a 41-year-old man were killed on Wednesday in a knife attack in Germany's Aschaffenburg. A 28-year-old man from Afghanistan has been arrested by the police.

A knife attack in Aschaffenburg, Germany, left two dead and two injured. An Afghan suspect was arrested as authorities investigate the motive.- Watch Video on English Oneindia

A 28-year-old man from Afghanistan was arrested following a knife attack on Wednesday in a park in the German city of Aschaffenburg in which two people were killed, including a toddler, police and the state health minister said.

A 28-year-old man from Afghanistan has been arrested following a knife attack in a park in the German city of Aschaffenburg on Wednesday in which two people were killed, including a toddler, police said.

In a tragic incident in Aschaffenburg, Germany, two individuals, including a young Moroccan child, lost their lives in a knife attack perpetrated by an Afghan man. The attack also left two others injured.