The B.C. government is investigating after several drivers reported being hit by falling slush or ice while crossing Metro Vancouver bridges Monday.

A number of motorists said they saw "slush bombs" plummeting onto vehicles and shattering windshields on both the Alex Fraser and Port Mann bridges in the early afternoon.

Surrey resident Joyce Brown told CTV Vancouver her 82-year-old mother was driving over the Alex Fraser shortly before 1 p.m. when something came crashing down onto her Mercedes.

"She's pretty shaken up," Brown said. "This thing hit her window and dented the whole thing."

The car's windshield cracked and left the senior covered in shards of glass, but she had to continue driving to avoid an accident.

"She didn't want to stop on the bridge and get hit, so she kept going and pulled over on Westminster Highway," Brown said.

It's unclear how many vehicles were affected. B.C.'s Ministry of Transportation has only confirmed that crews are in the process of assessing "snow concerns" on the bridge.

"We are looking into these reports and encourage any drivers who may have experienced damage to contact the ministry so that we can determine how it might have happened," deputy minister Patrick Livolsi said in a statement.

"We will continue to actively investigate these reports and we will use this information to identify any improvements that can be made for the future."

The government said it found the reports surprising; there have never been reports of falling ice on the Alex Fraser before, and cable-sweepers were installed on the Port Mann after the last major incident in 2012.

According to the Insurance Corporation of B.C., roughly 350 filed $400,000 worth of claims after ice started dropping onto cars in December 2012.

Snow-removing sweepers were placed on the Port Mann's overhanging cables afterward to prevent similar accidents, and the government said they have been effective.

Anyone whose vehicle was damaged by falling ice or snow on either of the bridges Monday is asked to contact the Ministry of Transportation at 604-424-8240.

With a report from CTV Vancouver's Michele Brunoro