Yaakov Katz reported in January for The Jerusalem Post that:

A suspicious package found last week on a bus carrying Israeli tourists from Turkey to Bulgaria was the cause for Israel's request to boost security over its citizens traveling in the country, according to reports in the Bulgarian press.

The Sofia News Agency Novinite quoted Dan Shenar, head of security at the Israeli Transportation Ministry, who confirmed he had requested the increased security. Bulgarian authorities have launched an investigation to determine what was inside the package and who placed it on the bus.

"Two days ago I got in touch with my colleagues in Sofia and asked them to tighten security measures around buses carrying groups of Israeli tourists between airports and hotels or vacation houses. We are well aware that buses are a weak spot in regards to security," Shenar was quoted as saying.

"This is so because there are excellent security conditions at airports, but the situation is not the same outside them. This is why we made these calls. As far as I understand, local services are collaborating with us."

According to another report, the Bulgarian police has increased its presence at the country's top winter resort called Bansko. Currently 50 policemen are patrolling the resort and another 80 are expected there by the end of the month, according to the report. The resort is frequented by Israelis.