The bombings are being blamed on regional drug cartels A wave of bomb attacks has hit the Mexican state of Tamaulipas, where police are investigating the mass killing of 72 migrants.
Four devices exploded separately in Tamaulipas in just 24 hours, injuring at least 17 people.
The explosions appeared to target places connected with the probe into the migrant killings.
Police are still searching for a prosecutor involved in the case who has been missing for several days.
Correspondents say it appears that gangsters are trying to stop those trying seeking evidence of the murders.
Three homemade bombs were detonated in the city of Reynosa, in the north of the state, on Saturday, say reports.
One exploded close to a church where a memorial mass was was being held for the migrants, whose bodies were found at ranch earlier this week.
Two other devices were detonated near the morgue where some of the victims’ bodies were being held.
The blast injured a police officer and a civilian and destroyed the guard’s hut in front of the building, a police source told the AFP news agency.
On Friday, two bombs exploded in the state capital, Ciudad Victoria, reports said, targeting a television station and the offices of the transport authorities. There were no reported injuries.
Police have said the attacks are probably the work of the Zetas drug cartel, which has also been blamed for the migrants’ deaths.
One survivor of that incident has told police the 58 men and 14 women were trying to make their way to the US when they were kidnapped by a criminal gang and shot when they refused to work for them.
Mexican prosecutors have said they are deeply concerned for the safety of Roberto Suarez, the prosecutor leading the investigation into the deaths.
He and a police officer travelling with him have been missing since Wednesday.
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