The incident happened on Tuesday evening in Jedlanka, in Poland’s eastern Lublin region, when two freight trains travelling in opposite directions hit concrete blocks placed on the tracks, officials said.
The blocks damaged the snowploughs at the front of the locomotives, but neither train derailed and neither driver was injured, reporters were told.
Rail traffic in the area was suspended for several hours.
Tusk told broadcaster Polsat News that authorities were examining whether the incident could have been an act of sabotage or "the result of human stupidity."
He said prosecutors were investigating the incident as they would any such event, particularly because it could have resulted in a serious accident.
Tusk said the initial findings did not suggest a "very professional operation," as Poland remains on alert for potential sabotage linked to Russia.
Marcin Kozak, spokesman for the Lublin District Prosecutor’s Office, said the investigation was being conducted on suspicion of causing a threat of a railway disaster.
Causing a transport disaster is punishable by up to 10 years in prison in Poland.
Kozak said the incident was most likely a "hooligan act," adding that police had recorded similar incidents at the location in the past.
The Central Bureau of Police Investigation (CBŚP) and the Internal Security Agency (ABW) were notified because of concerns over the security of railway infrastructure, state news agency PAP reported.
(sp/gs)
Source: PAP