At least three gendarmerie personnel were killed in the blast that occurred as explosives and fireworks from a previous blast site were being transferred for disposal.
Police were unable to say if the blast in the city of Blankenburg was deliberately set off or if it was an accident.
A gas tanker exploded at a ceramics factory in Khartoum on Tuesday, killing at least 23 people and injuring 45 more.
The explosion killed at least 74 people and injured several others near the town of Rahim Yar Khan in the south of Punjab province.
A Hamas interior ministry spokesman said security forces are making progress in their investigation to establish who was behind the blasts, but did not disclose further details.
A suicide car bomber targeted the police headquarters in a minority Shia neighbourhood in western Kabul, setting off a huge explosion that wounded dozens of people, Afghan officials said.
Initial investigations show a speeding car caused the collision.
Another 19 people were seriously injured and five others are missing.
A powerful explosion in the southern Swedish town of Linkoping damaged two adjacent buildings and injured at least 25 people, say officials.
Four of those injured were in serious condition after an explosion at an explosives factory in Dzerzhinsk, 400 kilometres from Moscow.
Officials say South Africans and Egyptians are among those injured when an explosive device went off, hitting the bus in Giza.
"A suicide bomber wearing an explosive belt blew himself up close to stalls at the crowded Jamila market," said a senior police officer, who asked not to be named.
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