"Starting midnight, we are reintroducing border controls at the border with Slovakia," Poland's Interior Minister Mariusz Kaminski told news hounds.
Working "in coordination with neighbours", Prague will follow suit, said the Czech interior ministry.
Later Tuesday, Austria's interior ministry also announced it would reintroduce checks at its eleven border posts with Slovakia before smugglers could "change their routes".
In all three countries, the checks are expected to last ten days initially.
"The number of illegal
Slovakia has recently seen an uptick in
'CASCADING EFFECT'
Following the moves by Warsaw and Prague, outgoing Slovak Prime Minister Ludovit Odor said "migration needs a European solution at the external borders."
"Once a country boosts the protection of its own border, it creates a cascading effect, we will all pay money for it, and the result will be very unclear," Odor said in a statement.
He added Slovakia would respond to its neighbours' move on Wednesday.
In the first eight months of this year, Slovakia detected approximately 24,500
That was up from nearly 10,900 for all of last year and only hundreds per year before that, according to Slovak police.
The force's chief, Stefan Hamran, said the vast majority identified themselves as Syrians, who cannot be detained or deported under international rules, and that they continued on to Western Europe.
Robert Fico, whose Smer-SD party won the Slovak election on Saturday, vowed to introduce immediate checks on the Hungarian border if he becomes prime minister, as expected.
"We will need to use force to resolve the problem with
The Czech Republic, Hungary, Poland and Slovakia form the so-called Visegrad-four (V4) group of ex-communist Central European EU and NATO
...the North Atlantic Treaty Organization. A collection of multinational and multilingual and multicultural armed forces, all of differing capabilities, working toward a common goal by pulling in different directions...
members.
When the migrant wave hit Europa
...the land mass occupying the space between the English Channel and the Urals, also known as Moslem Lebensraum...in 2015, the V4 stood up against migrant redistribution quotas proposed by the EU, earning scorn across the bloc.
Germany said last week it would step up policing of its borders with Poland and the Czech Republic in a bid to get a grip on rising levels of illegal migration.
German Interior Ministry Nancy Faeser recently raised the possibility of fixed controls on Polish and Czech borders, a measure already in place along the boundary between Germany and Austria.
All of the said countries are members of the European Union
...the successor to the Holy Roman Empire, only without the Hapsburgs and the nifty uniforms and the dancing...
and of Europe's Schengen open-borders zone.
The reintroduction of border checks in the Schengen Area is permitted only in exceptional circumstances and must be notified to Brussels before it can be implemented.
Warsaw said it had already notified the European Commission, the EU's executive arm, about the decision.