Dutch authorities closed down a notorious Amsterdam hookah bar Wednesday after a severed human head was discovered at its entrance, a grisly find believed to be linked to a drug war between rival gangs.

A passer-by signaled the gruesome scene to police, who linked it to the discovery of a decapitated body in a burnt-out car elsewhere in the city.

European countries will increase identity checks and baggage controls on trains after American passengers thwarted an attack on a high-speed train from Amsterdam to Paris, France's interior minister said Saturday.

Bernard Cazeneuve said the checks would be carried out "everywhere it is necessary" but did not give other details. He spoke after an emergency meeting in Paris with top security and transport officials from nine countries and the European Union in the wake of last week's attack attempt.

European ministers will gather in Paris for security talks at the weekend following last week's "targeted and premeditated" jihadist attack on a high-speed train that was foiled by passengers, it was announced Wednesday.

Prosecutors have charged 25-year-old Moroccan Ayoub El Khazzani over the attack, which saw him watch a jihadist video on his phone before entering a toilet in the train, remove his shirt, and step out armed with an assault rifle, 270 rounds of ammunition and a Luger pistol strapped to his chest.

The Californian capital Sacramento has announced it will be hosting a parade in honor of three young men lauded with thwarting possible carnage on a crowded French train. 

"Big news! We are throwing a parade for our 3 hometown heroes! Details and timing coming soon," Mayor Kevin Johnson tweeted Monday.

French investigators were on Saturday interrogating a man who was overpowered by two young American servicemen after he opened fire with a Kalashnikov on a train between Amsterdam and Paris.

The suspect is thought to be a 26-year-old of Moroccan origin who had lived in Spain, said French Interior Minister Bernard Cazeneuve.

Amy and her husband Joe were sitting quietly on the Amsterdam-Paris Thalys train Friday evening when the window behind her was shattered by a bullet, showering her with glass.

Another passenger, Damien, was reading a magazine when he heard what he described as a "click-click-click".

A heavily armed man opened fire on a high-speed train traveling from Amsterdam to Paris on Friday, injuring two people before being overpowered by two American passengers.

The motives behind the attack were not immediately known, although French prosecutors said a probe was being launched by counter-terrorism investigators.

Several thousand demonstrators gathered in Brussels on Sunday and several hundred in Amsterdam to plead for solidarity with cash-strapped Greece on the eve of a make-or-break summit with European leaders.

Addressing the crowd in Amsterdam, veteran Greek MEP Manolis Glezos urged Athens' creditors to give the country "one more year" to resolve its debt crisis.

Former Croatian Serb rebel leader Goran Hadzic, who has been diagnosed with brain cancer, arrived in Belgrade late Wednesday after the Yugoslav war crimes court ordered his provisional release, local media reported.

The plane from Amsterdam landed shortly after 11:00 pm (2100 GMT), the Beta news agency said.

A man suspected of selling heroin disguised as cocaine that killed three British tourists in Amsterdam has turned himself in, police said on Tuesday.

The 42-year-old walked into a police station early on Saturday morning, a statement said, while Dutch media reported that he surrendered after CCTV images were released of him selling the drug to Danish tourists.