By Robert Plummer
BBC News
Russia says it has detained 8 radical successful transportation with Saturday's detonation connected a cardinal span linking Russia to Crimea.
Its FSB information work said 5 of those held were Russians, portion the others were Ukrainian and Armenian.
The FSB has accused the Ukrainian information services of being down the onslaught connected the bridge.
The quality came arsenic explosions were reported successful the Ukrainian cities of Kherson, Zaporizhzhia and Nikopol.
The BBC's Hugo Bachega successful Kyiv said 5 explosions had been heard successful Kherson, 1 of the largest cities nether Russian occupation, portion determination were unconfirmed reports that the aerial defence strategy successful the metropolis had been activated.
He said it was not wide what had triggered the explosions.
The blast connected the Crimea Bridge was a almighty symbolic stroke to Russian President Vladimir Putin, who opened the span successful 2018, 4 years aft Russia's annexation of Crimea.
President Putin called it an "act of terrorism", saying Ukraine's quality forces had aimed to destruct a critically important portion of Russia's civilian infrastructure.
Russian forces retaliated connected Monday with a question of rocket strikes crossed the country, including cardinal Kyiv, sidesplitting 19 people.
Following much strikes connected Tuesday, Ukrainian President Volodymyr Zelensky has urged countries to deed Russia with much sanctions successful effect to "a caller question of terror".
He called connected the West to find caller ways to use governmental unit to Russia and enactment Ukraine.
The calls came aft helium met the G7 radical of nations for exigency virtual talks connected Tuesday.
The bloc - which consists of Canada, France, Germany, Italy, Japan, the UK and US - promised to proceed providing "financial, humanitarian, military, diplomatic and legal" enactment to his state "for arsenic agelong arsenic it takes".
Nato besides said it would basal with Ukraine for arsenic agelong arsenic necessary.
In different development, Polish pipeline relation Pern said it had detected a leak successful 1 pipeline successful the Druzhba strategy that carries lipid from Russia to Europe.
The find follows leaks successful the Nord Stream undersea state pipelines that transport Russian state to Europe, which person been wide blamed connected sabotage.
Europe is facing a terrible vigor situation successful the aftermath of Moscow's penetration of Ukraine arsenic it tries to wean itself disconnected Russian state and oil.
The continent has imposed pugnacious sanctions connected Russia successful an effort to enactment economical unit connected the Kremlin.
Pern said that astatine this point, the causes of the leak were unknown. It was detected successful a conception of the tube astir 70km from the cardinal Polish metropolis of Plock.