Hungary's prime minister has warned migrants that if they cross the border illegally they will be arrested from next week, Sky News reported Friday.

Viktor Orban said migrants had rebelled against the country's laws and had failed to co-operate with authorities in recent days.

Thousands of refugees have been entering Hungary from its southern neighbor Serbia as they try to make their way towards western European countries, including Germany.

It comes as Austria closes part of the A4 motorway near the Hungarian border for security reasons as scores of migrants tried to reach Vienna on foot.

Reporters estimate 1,000 people pushed through police cordons to make the 40-mile trip on foot on Friday as Austria's railway company, OeBB, stopped its service from and to Hungary due to overcrowding.

Services will remain suspended through the weekend, the company said in a statement.

Some 8,000 people crossed the border into Austria on Thursday and 3,600 had already made their way across since midnight.

Police spokesman Gerhard Koller said 1,500 people had spent the night outdoors.

Source: MENA