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Why Rihanna panicked?

London: Pop star Rihanna is said to have panicked when her `Diamonds` World Tour buses were stopped at the border between Michigan and Canada.

Her bus was stopped Monday and it delayed her show in Winnipeg on the same day, reports

According to a source, everything including the stage equipment was on that truck.

When the original trucks were stopped last week, a small amount of marijuana was found, although the source added this was not the case this time.

"There was no weed on her bus," the source added.

Rihanna posted her own thoughts on the latest incident on Twitter.

"They held my trucks at the border. This is not a good look for Winnipeg. My stage is in those trucks, disassembled. This means, the entire production could potentially start at a later time. My bus and I are at the venue," she wrote.