U.S. President Barack Obama and German Chancellor Angela Merkel during a telephone conversation have called for an end to violence in Ukraine, the White House has reported.

"The president and the chancellor discussed the situation in Ukraine and reiterated the urgent importance of durably ending the violence in eastern Ukraine and of full and rapid implementation of the Minsk agreements," reads a posting on the website of the White House.

"In addition, the president expressed his condolences on behalf of the American people for the victims of recent terrorist and other violent attacks in southern Germany," reads the statement.

"The president offered Germany the U.S. government's full support as the investigations into the attacks proceed. The leaders reaffirmed the necessity of close U.S.-German counterterrorism and broader security cooperation," according to the report.

Several attacks and explosions arranged by refugees have been recorded in Bavaria in recent days.