Authorities in Venice, Italy are investigating the source of a strange phosphorescent green liquid patch that appeared Sunday in the city’s famous Grand Canal. 

While no one has claimed responsibility for the water color change at the canal, there was an event in Rome last weekend staged by an environmentalist group that used a vegetable charcoal to turn the Trevi fountain's water black. The group claimed to act in response to the Italian government's climate policies.

Images and videos posted on social media show a bright patch of green in the canal along the populated areas of the city.

The city's fire department posted a video on Sunday as one of its boats journeyed on the waters and stated, "the Grand Canal colored in green is what the fire department found this morning as we intervened together with ARPAV to collect samples and analyze this abnormal color."

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Environmental authorities are working to determine what caused the water to turn bright green.

Venice's Interior Ministry's representative Michele di Bari and police are claiming that the bright green liquid does not pose a threat to the health of locals and tourists. 

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The governor of the Veneto region, Luca Zaia, posted a photo of the green liquid that spread through the water near the arched Rialto Bridge. The patch was reported by residents. Zaia said that officials had requested that the police investigate to determine who was behind the event.

The latest incident also sparked comparisons with an event in 1968 by Argentine artist García Uriburu who dyed the waters of the city's Grand Canal green in order to promote ecological awareness during the internationally recognized cultural festival, the Venice Biennale. 

The Associated Press contributed to his report.

The Indianapolis 500 was briefly paused on Sunday following a scary crash involving Kyle Kirkwood and Felix Rosenqvist with about 17 laps to go in the race.

Rosenqvist was cruising along the wall when he brushed up against it and lost control. He spun out, bringing out a caution flag immediately. As he was spinning, Kirkwood was trying to zoom past him but didn’t get by cleanly.

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Kirkwood’s rear left tire clipped the front of Rosenqvist’s vehicle and he lost control. The tire flew off Kirkwood’s car and over the fence along the track. Kirkwood hit the wall, went airborne and flipped over. The damaged vehicle skidded down the track and the red flag came out.

The tire flew into the parking lot and, luckily, didn’t hit anybody. One vehicle appeared to be damaged.

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Kirkwood was able to leave his crashed vehicle under his own power as he left the track to get checked out at the infield care facility.

He said after, "Thank God these cars are so safe."

The rest of the race field went around the track three times before they awaited the restart with 14 laps to go.

Kirkwood and Rosenqvist were having good days at the track before the crash. Rosenqvist finished in fourth place at last year’s event. Kirkwood finished in 17th.