A LITHUANIAN army chief has warned "our enemy doesn't sleep" amid fears Russian sabotage caused a plane crash.
Secret service officials in Vilnius are probing whether the smash this morning that left one dead was terrorism.
Police are recovering black boxes from the burnt-out wreckage of a DHL cargo jet that smashed into a home in the Lithuanian capital this morning.
The Boeing 737 was approaching Vilnius Airport when hit the ground, skidded a few hundred metres and struck a house at around 5.30am local time (3.30am GMT).
Audio from air traffic control exchanges with the pilot released yesterday showed there was no panic or alerts as it approached Vilnius airport.
The pilot said as he descended: “Could you please confirm expecting ILS, I am not expecting ILS.”
An ILS - Instrument Landing System - helps pilots land safely in low visibility but was not required as the plane, call-sign Swift18D, was told to descend to 4,000ft then to 2,700ft.
It was then given clearance to land before contact with controllers stopped as it vanished off radar and crashed
Security camera footage showed the jet descending behind a warehouse before the sky lit up in a bright orange fireball, followed by plumes of thick dark smoke.
A Spanish crew member on board was killed - with three others injured.
It has reignited fears of a Russian covert sabotage operation after a series of mysterious explosions at DHL warehouses in Europe - including in Leipzig, Germany and UK city Birmingham.
The DHL jet was travelling from Leipzig today when it crashed.
Lithuania's National Crisis Management Centre has deployed experts to investigate.
Authorities have refused to rule out terrorism as experts from the National Crisis Management Centre investigate.
Lithuanian counter-intelligence chief Darius Jauniskis said: "We cannot reject the possibility of terrorism.
“But at the moment we can't make attributions or point fingers, because we don't have such information."
Head of the centre Vilmantas Vitkauskas told LRT: "According to the initial version, the incident may be related to technical problems.
"However, it is too early to talk about anything more precise."
Raimundas Vaikšnoras, commander of Lithuania's army, said the military has "a lot of knowledge" about the crash - but would not comment.
He said there is speculation it could be part of a Russian sabotage plot as "our enemy does not sleep".
Vaikšnoras added: "We provide the necessary assistance, for example, to reverse the data, look at the navigation, where, what happened.
SECURITY officials fear Russia could be behind parcel explosions at depots in Europe as part of a plot to trigger explosions on cargo flights to the US.
Western governments believe Moscow could be behind a series of fires and acts of sabotage in Europe aimed at destabilising allies of Ukraine.
On July 22, a suspect package caught fire at a DHL depot in Minworth, Birmingham.
Also in July, fires broke out in a container due to be loaded onto a DHL cargo plane in the German city of Leipzig.
Meanwhile, a fire at a transport hub near Jablonow, near Warsaw, Poland took almost two hours to put out.
Polish police arrested four people - and claimed the suspected Russian arson attacks could have been a test run for future attacks on the US.
It is feared the fears were part of an orchestrated campaign organised by Russia's military intelligence agency, the GRU.
Moscow, which denies being behind acts of sabotage is suspected to have been behind other attacks on warehouses and railway networks in EU member states this year - including in Sweden and in the Czech Republic.
Western nations including the UK, Britain, and the US, have repeatedly accused Russia of trying to sabotage nations providing military and financial aid to Ukraine.
"But we probably need to wait when the black box is removed and then the aviation or disaster investigation committee will resolve everything.
"These provocations, such as GPS signal blocking, have happened before, and not only Lithuanian airlines or those flying from Lithuania complain.
"But maybe we should wait for the investigation."
On November 5, Putin agents were said to be suspected of launching a “dry run” for attacks using magnesium incendiaries hidden in crates of “personal massagers.”
The massagers contained explosives which would have started fires which would have been impossible to put out with on-board extinguishers, experts said.
One of the devices burst into flames at a DHL cargo terminal in Minworth near Birmingham in July.
Another destroyed the contents of a shipping container after exploding in Leipzig, Germany - from where the doomed DHL plane took off for Vilnius at 2.08am today.
Putin goons are also suspected of addressing dummy parcels to the US and Canada to test other routes for a future state-sponsored “hybrid war” attacks,
