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Image 1 of / 13 Caption Close Image 2 of 13 Police investigate an accident on the Katy Freeway at Shepherd on Monday, April 16, 2012. (Johnny Hanson/Chronicle) Police investigate an accident on the Katy Freeway at Shepherd on Monday, April 16, 2012. (Johnny Hanson/Chronicle) Image 3 of 13 Police investigate an accident on the Katy Freeway at Shepherd on Monday, April 16, 2012. (Johnny Hanson/Chronicle) Police investigate an accident on the Katy Freeway at Shepherd on Monday, April 16, 2012. (Johnny Hanson/Chronicle) Image 4 of 13 Emergency personnel attend an accident victim following a collision on the eastbound lanes of Allen Parkway near Shepherd Monday, April 16, 2012, in Houston. Police said a westbound truck, driving on Allen Parkway, lost control of the vehicle, hopping the median and colliding with an eastbound car. At least three people were transported to hospitals by ambulance. ( Brett Coomer / Houston Chronicle ) less Emergency personnel attend an accident victim following a collision on the eastbound lanes of Allen Parkway near Shepherd Monday, April 16, 2012, in Houston. Police said a westbound truck, driving on Allen ... more Photo: Brett Coomer / Houston Chronicle Image 5 of 13 Image 6 of 13 Emergency personnel attend an accident victim following a collision on the eastbound lanes of Allen Parkway near Shepherd Monday, April 16, 2012, in Houston. Police said a westbound truck, driving on Allen Parkway, lost control of the vehicle, hopping the median and colliding with an eastbound car. At least three people were transported to hospitals by ambulance. ( Brett Coomer / Houston Chronicle ) less Emergency personnel attend an accident victim following a collision on the eastbound lanes of Allen Parkway near Shepherd Monday, April 16, 2012, in Houston. Police said a westbound truck, driving on Allen ... more Photo: Brett Coomer / Houston Chronicle Image 7 of 13 Emergency personnel attend an accident victim following a collision on the eastbound lanes of Allen Parkway near Shepherd Monday, April 16, 2012, in Houston. Police said a westbound truck, driving on Allen Parkway, lost control of the vehicle, hopping the median and colliding with an eastbound car. At least three people were transported to hospitals by ambulance. ( Brett Coomer / Houston Chronicle ) less Emergency personnel attend an accident victim following a collision on the eastbound lanes of Allen Parkway near Shepherd Monday, April 16, 2012, in Houston. Police said a westbound truck, driving on Allen ... more Photo: Brett Coomer / Houston Chronicle Image 8 of 13 Emergency personnel attend an accident victim following a collision on the eastbound lanes of Allen Parkway near Shepherd Monday, April 16, 2012, in Houston. Police said a westbound truck, driving on Allen Parkway, lost control of the vehicle, hopping the median and colliding with an eastbound car. At least three people were transported to hospitals by ambulance. ( Brett Coomer / Houston Chronicle ) less Emergency personnel attend an accident victim following a collision on the eastbound lanes of Allen Parkway near Shepherd Monday, April 16, 2012, in Houston. Police said a westbound truck, driving on Allen ... more Photo: Brett Coomer / Houston Chronicle Image 9 of 13 Cars sit in traffic at Studemont around 3 p.m. Monday. Cars sit in traffic at Studemont around 3 p.m. Monday. Photo: Transtar Image 10 of 13 Image 11 of 13 Cars sit in traffic at Washington around 3 p.m. Monday. Cars sit in traffic at Washington around 3 p.m. Monday. Photo: Transtar Image 12 of 13 Cars sit in traffic at Heights around 3 p.m. Monday. Cars sit in traffic at Heights around 3 p.m. Monday. Image 13 of 13 Katy Freeway reopened after semi wreck 1 / 13 Back to Gallery

UPDATE: At 5:35 p.m. TxDOT reported that all westbound and eastbound lanes of the Katy Freeway were open to traffic.

ORIGINAL POST: A wreck involving an 18-wheeler truck on Katy Freeway closed I-10 eastbound at Shepherd around 2 p.m. and had I-10 westbound traffic slowed to a single lane, one of several accidents reported in the area during rainy driving conditions Monday afternoon.

“The rig overturned, partially blocking one westbound lane. Fuel spilled on the eastbound side and that will likely take awhile to clean up,” KHOU reported. “Two people were hurt and taken to area hospitals.”

As of 5 p.m., HAZMAT crews had not yet arrived to the site to begin cleanup, the station said.

Additional accidents were reported along the East Freeway, the Katy Freeway, the Gulf Freeway and two sections of the Sam Houston Tollway, according to Houston Transtar.

Another accident on Allen Parkway at Shepherd injured at least three people when a pickup truck headed west hopped the median and struck a car on the other side, police said.