In a separate incident, a truck was also struck around 800 metres from a border crossing with Poland.
In a separate incident, a truck was also struck around 800 metres from a border crossing with Poland.
The poll follows controversy over comments by a senior opposition figure casting doubt over Poland fulfilling its NATO obligations.
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However, the Pentagon’s spokesman stopped short of confirming that there would be no reduction in troop numbers in Poland.
There is “no better proof of the durability, reliability and long-term outlook of Polish-US cooperation”, says PM Donald Tusk.
The agreement reinforces growing economic and defence ties between Poland and Sweden.
Leading US media outlets have reported that the deployment of almost 4,000 American troops was cancelled at the last minute.
The Sullivan Cup is a gruelling biennial contest hosted by the United States to evaluate the best tank crews.
Poland is the first of 19 member states to sign a SAFE agreement and the largest recipient of funds under the programme.
Unexploded ordnance from World War Two is regularly found around Poland.
The ABW also pointed to a range of other threats, including espionage by China and the radicalisation of Poland’s youth.
The prime minister previously said he would not want to “undermine European solidarity” by “poaching” US troops from Germany.
His remarks have been strongly criticised by the opposition, who say that Tusk is prioritising Germany’s interests over Poland’s security.
They will be the first tanks produced in Poland for almost two decades.
The exchange was negotiated with the support of the United States.