Security has been stepped up for Hungary's top officials after police detained six people last week, Reuters reports citing anti-terror police.

Four of the pople arrested were heading to Budapest in a car where explosives were found.

Separately, a "bomb laboratory" was discovered with explosives and devices "suitable for killing people to the utmost extent", the agency quotes the Counter Terrorism Center's Director General Janos Hajdu as saying.

An Islamist link is not ruled out in the investigation.

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