World

Rocket fire heard in eastern Ukrainian city of Donetsk, imperiling cease-fire deal

  • Ukrainians hold posters during a remembrance ceremony in memory of the Sept. 11 terror attacks  in the United States and  memory of the people, who died during the Boeing 777, Malaysia Airlines flight MH17 crash in eastern Ukraine at the monument of victims of terror in Kiev, Ukraine, Thursday, Sept. 11, 2014.  (AP Photo/Efrem Lukatsky)

    Ukrainians hold posters during a remembrance ceremony in memory of the Sept. 11 terror attacks in the United States and memory of the people, who died during the Boeing 777, Malaysia Airlines flight MH17 crash in eastern Ukraine at the monument of victims of terror in Kiev, Ukraine, Thursday, Sept. 11, 2014. (AP Photo/Efrem Lukatsky)  (The Associated Press)

  • Ukrainians hold posters during a remembrance ceremony in memory of the Sept. 11 terror attacks  in the United States and memory of the people, who died during the Boeing 777, Malaysia Airlines flight MH17 crash in eastern Ukraine at the monument of victims of terror in Kiev, Ukraine, Thursday, Sept. 11, 2014.  Text reading: 'People have a right to life'.(AP Photo/Efrem Lukatsky)

    Ukrainians hold posters during a remembrance ceremony in memory of the Sept. 11 terror attacks in the United States and memory of the people, who died during the Boeing 777, Malaysia Airlines flight MH17 crash in eastern Ukraine at the monument of victims of terror in Kiev, Ukraine, Thursday, Sept. 11, 2014. Text reading: 'People have a right to life'.(AP Photo/Efrem Lukatsky)  (The Associated Press)

  • Ukrainians children lay flowers and toys on the monument of victims of terror during a remembrance ceremony in memory of the Sept. 11 terror attacks  in the United States and  memory of the people, who died during the Boeing 777, Malaysia Airlines flight MH17 crash in eastern Ukraine in Kiev, Ukraine, Thursday, Sept. 11, 2014. (AP Photo/Efrem Lukatsky)

    Ukrainians children lay flowers and toys on the monument of victims of terror during a remembrance ceremony in memory of the Sept. 11 terror attacks in the United States and memory of the people, who died during the Boeing 777, Malaysia Airlines flight MH17 crash in eastern Ukraine in Kiev, Ukraine, Thursday, Sept. 11, 2014. (AP Photo/Efrem Lukatsky)  (The Associated Press)

Two volleys of Grad rocket fire rang out in Ukraine's eastern, rebel-held city of Donetsk, underscoring the difficulties of enforcing a cease-fire almost a week after it was signed.

The city council of Donetsk confirmed in a statement Thursday there had been multiple explosions during the morning, but reported no casualties.

Col. Andriy Lysenko, spokesman for Ukraine's National Security and Defense Council, told journalists that a large swath of the border near the Sea of Azov had come under full rebel control. While the changes likely happened before the cease-fire, it was an unusual admission by Ukraine of the scale of a rebel counteroffensive that Kiev says was backed by Russia.

The cease-fire between Russian-backed separatists and Ukrainian troops was imposed late Friday but has been riddled by violations.